Expert Consensus and Narrative Review on the Management of Multiple Sclerosis in the Arabian Gulf in the COVID-19 Era: Focus on Disease-Modifying Therapies and Vaccination Against COVID-19

Abstract

This article describes consensus recommendations from an expert group of neurologists from the Arabian Gulf region on the management of relapsing multiple sclerosis (RMS) in the COVID-19 era. MS appears not to be a risk factor for severe adverse COVID-19 outcomes (though patients with advanced disability or a progressive phenotype are at higher risk). Disease-modifying therapy (DMT)-based care appears generally safe for patients with MS who develop COVID-19 (although there may be an increased risk of adverse outcomes with anti-CD20 therapy). Interferon-β, teriflunomide, dimethyl fumarate, glatiramer acetate, natalizumab and cladribine tablets are unlikely to increase the risk of infection; fingolimod, anti-CD20 agents and alemtuzumab may confer an intermediate risk. Existing DMT therapy should be continued at this time. For patients requiring initiation of a DMT, all currently available DMTs except alemtuzumab can be started safely at this time; initiate alemtuzumab subject to careful individual risk–benefit considerations. Patients should receive vaccination against COVID-19 where possible, with no interruption of existing DMT-based care. There is no need to alter the administration of interferon-β, teriflunomide, dimethyl fumarate, glatiramer acetate, natalizumab, fingolimod or cladribine tablets for vaccination; new starts on other DMTs should be delayed for up to 6 weeks after completion of vaccination to allow the immune response to develop. Doses of the Oxford University/AstraZeneca vaccine may be scheduled around doses of anti-CD20 or alemtuzumab. Where white cell counts are suppressed by treatment, these should be allowed to recover before vaccination.

Key Summary Points

Multiple sclerosis (MS) appears not to be a risk factor for severe adverse COVID-19 outcomes per se in the absence of advanced disability or a progressive phenotype.

Disease-modifying therapy (DMT)-based care is generally safe for patients with MS who develop COVID-19 (more research is needed for anti-CD20 therapies, which may be associated with severe COVID-19).

All currently available DMTs except alemtuzumab can be started safely at this time (careful individual risk–benefit consideration is needed for alemtuzumab).

There is no need to alter the administration of interferon-β, teriflunomide, dimethyl fumarate, glatiramer acetate, natalizumab, fingolimod or cladribine tablets for vaccination against COVID-19.

Delay new starts on other (high-efficacy) DMTs for up to 6 weeks after completion of vaccination (allow white cell counts to recover where applicable).

Digital Features

This article is published with digital features, including a summary slide, to facilitate understanding of the article. To view digital features for this article go to https://doi.org/10.6084/m9.figshare.14635935.

Introduction: COVID-19 in the Arabian Gulf

COVID-19 in the Arabian Gulf

The COVID-19 pandemic reached countries in the Arabian Gulf in February 2020. Initial cases were imported from the proposed location of the source of the virus in Wuhan, China, followed by clusters of cases associated with travel between Gulf countries and Iran [1, 2]. Countries in the region responded quickly with measures to suppress transmission of the virus. Measures undertaken included restrictions on international travel, restrictions of internal travel, closure of educational institutions and mosques, and restrictions on public gathering in leisure, sporting and retail settings. Later, local lockdowns (with or without evening/night-time curfews) were introduced in a number of cities. Testing facilities for detecting cases of COVID-19 were introduced (the UAE was an early adopter of drive-through testing centres to minimise person-to-person contact).

Similar measures have been adopted in virtually all countries during the past year [3]. The rate of new cases reported in the previous 24 h at the time of writing by the World Health Organization (WHO) is now variable between Gulf countries, and overlaps the rate seen in major economies around the world (Fig. 1a) [4, 5]. The number of deaths/million population associated with COVID-19 has been low for Gulf countries, compared with most of these other countries, perhaps indicating some success over the duration of the pandemic [4, 5].

Fig. 1.

Current status of the COVID-19 pandemic in the Arabian Gulf in comparison with selected nations from other regions of the world. Data on new cases of COVID-19 were reported during the previous 24 h according to the World Health Organization (WHO) for March 13, 2021 [4]. Population figures were from Worldometer [5]. Rates per million population are unadjusted. KSA Kingdom of Saudi Arabia, UK United Kingdom, USA Unites States of America

Rationale and Methods for this Article

Mass vaccination programmes with novel anti-SARS-CoV-2 vaccines now provide hope for an end to the darkest days of the COVID-19 pandemic, and the clinical landscape will eventually tend to an as yet only partially understood “new normal”. This is of great concern to physicians and patients, including those with long-term non-communicable diseases that need lifelong treatment. The care of relapsing multiple sclerosis (RMS) represents a special case within this group, as the disease-modifying treatments we prescribe interact with, and sometimes suppress, the immune system.

We, an expert group of specialist neurologists from five countries within the Arabian Gulf, met virtually to consider the impact of COVID-19 on care for RMS, and provide our consensus recommendations for the future management of RMS in the COVID-19 era, including on the use of DMTs and how and when to administer anti-COVID-19 vaccinations.

Literature was identified by searching PubMed using search terms such as “Covid”, “multiple sclerosis” and “disease modifying therapy”, as well as individual DMTs. Authors also contributed literature of potential interest. An informal consensus procedure was performed, where experts voted on issues relating to MS care and the use of DMTs. We did not use a formal methodology for expressing consensus. We show the number of votes cast for a given proposition where there was not complete agreement, to illustrate the strength or otherwise of a consensus. This article is intended to provide guidance to practising physicians in a novel, complex and changing situation. We have not allocated a grade or strength of evidence or strength of recommendation, because evidence is lacking in most areas. This article is based on previously conducted studies and does not contain any new studies with human participants or animals performed by any of the authors.

COVID-19 and Multiple Sclerosis

Impact of COVID-19 on Management of Multiple Sclerosis

Healthcare systems in the Middle East and elsewhere around the world have been put under immense stress by the sudden influx of people with COVID-19, who may often require intensive care and possibly assisted ventilation [3, 6]. Diversion of physicians and other resources from other areas of medicine has led to postponement or suspension of routine care for populations with a range of with non-communicable diseases, even in advanced economies, with potentially adverse consequences for long-term patient outcomes [7, 8].

The relatively robust and advanced medical infrastructure of countries of the Gulf Cooperation Council have left these states reasonably well prepared to cope with these challenges [9]. Nevertheless, the authors have noted constraints on their own neurology practice, consistent with the issues described above, which affect both physicians and patients (Table 1). The COVID-19 pandemic has changed medical practice, perhaps forever.

Table 1.

Impact of the COVID-19 pandemic on the authors’ routine neurology practice

Physicians/healthcare system	Patients
Routine consultations postponed or cancelled	Patients often fear attendance at the hospital in person
Major switch from face-to-face consultations to telephone or video consultations	Attendance at hospital is reduced (especially for patients without disabling MS symptoms or highly active MS)
Telephone hotlines have been set up to meet this demand	Patients are more frequently using WhatsApp to contact their physician remotely
Medications frequently sent to patients’ homes rather than collection from the medical centre pharmacy (infusion centres still operated normally providing day care services)

Based on the personal experience of the authors of this article

Management of Multiple Sclerosis in the COVID-19 Era

Risk Factors for Serious Adverse COVID-19 Outcomes

The principal risk factors for adverse COVID-19 outcomes (e.g. hospitalisation, need for intensive care, or death) in cohort studies of general populations have included male gender, ethnicity, higher age, obesity, hypertension, multiple comorbidities (including neoplasms, cardiovascular disease, diabetes or obstructive airways disease) and lymphopenia or leukopenia [10–14]. Any patient with MS may have one of more of these risk factors, which appear to exert similar effects on outcomes as people without MS [15]. The presence of these risk factors may influence aspects of management, perhaps especially vaccination against COVID-19 (see below). Most available evidence suggests that a diagnosis of RMS per se does not appear to confer increased risk either of catching COVID-19, or of a more severe, adverse outcome if a patient does contract COVID-19 [16–20].

Progressive MS [16], and possibly advanced disability in people with MS [21], has been identified as a risk factor for a potentially severe adverse COVID-19 outcome, however. In addition, concern over COVID-19 has been identified as a source of fear and anxiety in patients with MS [22], and physicians may need to provide reassurance on the lack of association between MS and adverse COVID-19 outcomes. Another study proposed reduced physical activity during lockdowns as an important mediator of reduced psychological health among people with MS [23].

Recommendations for Use of Disease-Modifying Treatments in Management of Multiple Sclerosis in the Arabian Gulf

Current Evidence

In theory, DMTs that induce immunosuppression might increase the risk of adverse long-term outcomes in people with MS who develop COVID-19. Published data on the association between receipt of a DMT for RMS and clinical outcomes in people with COVID-19 are limited at present, and much of the available data are in presentations rather than peer-reviewed publications. Nevertheless, DMT-based therapy for people with RMS in general does not appear to be associated with an increased risk of contracting COVID-19 or developing a severe adverse COVID-19 outcome [15, 18, 19, 24–27]. There is a suggestion that COVID-19 outcomes may have been more severely adverse in people with MS who received treatment with anti-CD20 agents (ocrelizumab, ofatumumab or rituximab) for MS, compared with other DMTs [15, 28–30], although this has not been a universal finding [31–33]. More severe COVID-19 associated with anti-CD20 therapies has also been observed in patients receiving an anti-CD20 agent for conditions other than MS [34, 35].

Gulf Expert Opinion

Generally, most DMTs were not considered by the authors to be associated with an increased risk of contracting COVID-19. We proposed a higher, intermediate risk for alemtuzumab and anti-CD20 agents (Table 2; Fig. 2); this is based on the known increase in susceptibility to viral infections in general, compared with other DMTs, and does not apply to an increased risk of contracting COVID-19 at this time. Expert opinion was unanimous, or near unanimous, in favour of starting new treatment or continuing existing treatment at this time with glatiramer acetate, interferon-β, dimethyl fumarate, teriflunomide, natalizumab, fingolimod or cladribine tablets (Table 2; Fig. 3). Extended interval (e.g. 6 weekly) dosing with natalizumab does not appear to reduce the efficacy of this DMT [36], and is an option where MS disease activity is well controlled on this treatment. Support for starting anti-CD20 treatment was less strong, and there was no consensus in favour of initiating or continuing treatment with alemtuzumab (Table 2; Fig. 3).

Table 2.

Summary of recommendations on use of disease-modifying therapy (DMT) in the COVID-19 era

	Risk of COVID-19 infection	Risk of severe COVID-19 on treatment?	Safe to start a new DMT?	Safe to continue an existing DMT?
Interferon-β or glatiramer acetate	Very Low	Very unlikely	Yes	Yes
Teriflunomide	Low	Very unlikely	Yes	Yes
Natalizumab	Low	Very unlikely	Yes	Yesa
Dimethyl fumarate	Low	Very unlikely	Yes	Yes
Cladribine tablets	Low	Very unlikely	Yes	Yes
Fingolimod	Low	Very unlikely	Yes	Yes
Anti-CD20	Intermediateb	Possiblec	Yes (Assess risk–benefit ratio)	Yes
Alemtuzumab	Intermediateb	Very unlikely	Probably not	Assess risk–benefit ratio

^aConsider 6-weekly administration schedule if MS disease activity is controlled. Based on the expert opinion of the authors

^bThis opinion is based on the known association of anti-CD20 or alemtuzumab therapy with an increased risk of some infections, and the risk of COVID-19 infection per se during treatment with these therapies remains to be determined

^cMore severe COVID-19 has been observed in patients receiving anti-CD20 therapies in several studies, though some others have not demonstrated such an association. Our opinion that this relationship is “possible” is a cautious position based on current available evidence, and further research will resolve the actual level of risk

Fig. 2.

Average of experts’ responses to the question, “In your opinion, does the use of following DMTs increase the risk of infection with COVID-19?” Experts responded to the question with an integer rating of 1 (strongly disagree) to 5 (strongly agree) and bars are the mean of these ratings. “High-efficacy” disease-modifying therapies (DMTs, as categorised by the authors) are shown in dark blue; “platform” or “first-line” DMTs are shown in light blue

Fig. 3.

Expert opinion on starting a new disease-modifying therapy (Question 1, solid bars) or continuing an existing DMT therapy (Question 2, hatched bars) for a patient with multiple sclerosis. GA glatiramer acetate

The authors’ recommendations were generally consistent with the labelling for these DMTs (Table 3). Interferon-β, glatiramer acetate and teriflunomide are not strongly associated with an increased risk of serious infections in their European labels, although some opportunistic infections are noted as a side effect of glatiramer acetate. High-efficacy DMTs are associated more strongly with an increased risk of infections, including reactivation of latent infections (Table 3). Confidence in initiating or continuing alemtuzumab was lower because of the challenging safety profile of this DMT, and its association with prolonged lymphopenia after administration (lymphocytes were suppressed for about 6 months after each administration of alemtuzumab in the CARE MS I and CARE MS II phase III trials [37]). Current guidance from the MS International Federation considered that evidence is insufficient to evaluate the place of alemtuzumab in MS care at this time [38]. Patients who are due for a course of treatment with alemtuzumab should discuss the timing of this with their healthcare practitioner (advice is similar for cladribine tablets and anti-CD20 agents) [38].

Table 3.

Overview of statements from European prescribing documentation for disease-modifying therapies (DMTs) for MS regarding risks of infection and application of vaccination

DMT	Statements on risk of infection	Statements on vaccination
Interferon-β	None	None
Glatiramer acetatea	Infection, influenza, bronchitis, gastroenteritis, herpes simplex, otitis media, rhinitis, tooth abscess, vaginal candidiasis are listed as “very common”b or “common”c side effects	None
Dimethyl fumarate	Do not initiate during severe active infection and consider suspending treatment if serious infection develops	Inactivated vaccines were safe and effective during treatment; avoid use of attenuated live vaccines
Teriflunomide	No increase in serious infections. Monitor infections carefully and consider withdrawal for serious infections	Non-live vaccines may be considered during treatment, but avoid use of attenuated live vaccines
Fingolimod	Serious, life-threatening/fatal cases of encephalitis, meningitis or meningoencephalitis caused by herpes simplex and VZV have occurred; HPV has also been reported	Fingolimod may reduce the effectiveness of vaccinations for up to 2 months after treatment. Vaccinate for VZV in antibody-negative patients 1 month before treatment initiation. Consider vaccination for HPV before initiation. Avoid use of attenuated live vaccines
Natalizumab	Testing for antibodies to JCV is recommended prior to initiation. Monitor regularly for PML or GCN. Screen for PML regularly using MRI for high-risk patients.d Suggestion of increased risk of herpes or VZV infections	No or minor effect on the efficacy of vaccinations has been observed. No data on live vaccines
Cladribine tablets	Risk of activation of latent infections, including TB, hepatitis and herpes zoster (treat infections before initiation)	Vaccinate for VZV in antibody-negative patients 4–6 weeks before treatment initiation. Avoid use of live or attenuated live vaccines while WBC counts are outside normal limits
Ocrelizumab	PML has been observed with other anti-CD20 agents (evaluate suspected cases with MRI). Reactivation of hepatitis B has been observed (screen/treat as necessary)	Avoid live or attenuated live vaccines while B lymphocytes are depleted. Inactivated seasonal influenza vaccines are preferred. Perform any required vaccination at least 6 weeks before initiation
Alemtuzumab	URTI, UTI, herpes zoster, LRTI, gastroenteritis, oral candidiasis, vulvovaginal candidiasis, influenza, ear infection, pneumonia, vaginal infection, tooth infection are described as “common”b or “very common”c side effects	Avoid live vaccines in recently treated patients. Consider VZV vaccination for antibody-negative patients before initiation. Delay initiation for at least 6 weeks after any vaccine

Information was abstracted from European Summaries of Product Characteristics. Interferon-β1a (Rebif®, Merck KGaA) was used as an example of this class of DMT. Statements have been edited for conciseness: always consult the full documentation before prescribing. Recommendations on vaccination assume no contraindications. ^aNot available for prescription in the Arabian Gulf. Side effects expected in at least ^b10% or ^c1% of patients; “uncommon” side effects (< 1% of patients) are not shown here for clarity. ^dPatients who are anti-JCV antibody positive with more than 2 years of treatment with natalizumab therapy, who have also have received prior immunosuppressant therapy or patients with a high anti-JCV antibody index who have received more than 2 years of natalizumab without prior immunosuppression. GCN granule cell neuronopathy, JCV John Cunningham virus, LRTI lower respiratory tract infection, PML progressive multifocal leukoencephalopathy, TB tuberculosis, URTI upper respiratory tract infection, UTI urinary tract infection, VZV varicella zoster virus, WBC white blood cell

Vaccinating People with Multiple Sclerosis Against COVID-19

Overview of COVID-19 Vaccines Available in the Arabian Gulf

The development of vaccines against SARS-CoV-2 is proceeding worldwide at an unprecedented rate. As of March 16, 2021, 42 such vaccines were described as being in phase I clinical evaluation, with 32 and 22 further candidate vaccines in phase II and phase III, respectively [39]. Table 4 describes the main characteristics of seven anti-SARS-CoV-2 vaccines already in clinical use [40–49]. These vaccines vary considerably in their underlying technology, and generate antigens that resemble a segment of SARS-CoV-2 spike protein in vivo via delivery of modified mRNA using liposomes (Pfizer/BioNTech, Moderna), DNA delivered by a recombinant adenoviral vector that is incapable of replication (Oxford University/AstraZeneca [OxAZ], Sputnik V, Janssen), a peptide fragment (Novavax), or inactivated virus produced in cultured cells (Sinopharm).

Table 4.

Anti-SARS-CoV-2 vaccines in therapeutic use at the time of writing

Sponsor	Name of vaccine	Antigen generation	No. of doses needed	Efficacy [ref for Phase III study]	Storage
Oxford University and AstraZeneca	AZD1222	DNA in recombinant non-replicating adenoviral vector	2 (4–12 weeks apart)	62% (confirmed symptomatic COVID-19 infection) [37]	Normal refrigeration (2–8 °C)
Gamaleya	Sputnik V	DNA in recombinant non-replicating adenoviral vector	2 (3 weeks apart)	92% (confirmed symptomatic COVID-19) [38]	Normal refrigeration (2–8 °C)
Moderna/NIH	mRNA-1273	mRNA contained within liposomes	2 (4 weeks apart)	94% (confirmed symptomatic COVID-19) [39]	Between − 25 °C and − 15 °C (2–8 °C for up to 30 days thawed)
Pfizer/BioNTech	BNT162b2	mRNA contained within liposomes	2 (3 weeks apart)	95% (confirmed symptomatic COVID-19) [40]	− 80 °C to − 60 °C and up to 120 h at 2–8 °C after thawing
Sinopharm	BBIBP-CorV	Inactivated SARS-CoV-2 virus	2 (3 weeks apart)	79% (precise endpoint unclear) [41]a	Normal refrigeration (2–8 °C)
Janssen (Johnson & Johnson)	Ad26.COV2.S or JNJ-78436725	DNA in recombinant non-replicating adenoviral vector	1	66% (confirmed moderate or severe COVID-19 [42]a	Normal refrigeration (2–8 °C)
Novavax	NVX-CoV2373	Recombinant viral spike proteins	2 (3 weeks apart)	89% (confirmed symptomatic COVID-19) [43]a	Normal refrigeration (2–8 °C)

NIH US National Institutes of Health

^aData from press releases; peer-reviewed publication awaited at the time of writing. Information on vaccines not relating to phase 3 data was from refs [36, 44–46]

Multiple vaccines are available in the Arabian Gulf. Importantly, none of these vaccines contain live or attenuated live virus that is capable of replication and/or initiation of COVID-19 infection in vivo, including in an immunocompromised patient. At present, we have no data on which vaccine(s) might be most or least appropriate for use in people with MS, and this would be an interesting topic for future research when more data are available.

Recommendations on Vaccination Against COVID-19 for People with Multiple Sclerosis in the Arabian Gulf

Advice on vaccination in the labelling for DMTs, where given, relates to routine local vaccination practice or to prophylactic vaccination against opportunistic or latent infections (Table 3). Live or attenuated live vaccines should be avoided during treatment with most DMTs for fear of initiating an infection in a patient whose immune status has been compromised by a treatment that induces prolonged or permanent immunosuppression (Table 3); this is not a concern for current COVID-19 vaccines, as described above. There are currently few data on the immunologic response to a COVID-19 vaccination in patients receiving a DMT for MS, although in theory long-term immunosuppression might reduce a vaccine’s effectiveness. Studies of responses to other vaccinations will be reviewed briefly here, to consider the effects of these treatments on the response to vaccination per se.

Table 5 shows our recommendations on vaccination against COVID-19 for a patient either starting a new DMT or already receiving a DMT. The effect of a first-line DMT (interferon-β, dimethyl fumarate, teriflunomide, glatiramer acetate) on the efficacy of a vaccination is likely to be small or absent, and vaccination should proceed irrespective of the DMT treatment plan [50–54]. Natalizumab has also been shown not to diminish the response to other vaccines [55], and new or continued treatment with this agent is also no barrier to accessing vaccination against COVID-19. It is important not to stop treatment with natalizumab for vaccination, as this may provoke MS disease reactivation [56]. In addition, our recommendations on vaccination have been designed to accommodate the administration regimen of cladribine tablets, and no change to this regimen is required. Data from patients with MS has demonstrated adequate responses to other vaccines during years 1 and 2 of treatment with cladribine tablets irrespective of the duration from the last dose and the lymphocyte count [57, 58], and this needs to be confirmed with regard to vaccinations for COVID-19, with special reference to the timings of administration of the DMT and the vaccine.

Table 5.

Summary of recommendations on vaccination against COVID-19 for people about to receive, or already receiving, a disease-modifying therapy (DMT)

DMT	New DMT starts	Ongoing DMT therapy
Interferon-β, teriflunomide, dimethyl fumarate, glatiramer acetate, natalizumab, cladribine tabletsa	Vaccinate (any vaccine) while starting or continuing treatment, with no modification of the MS treatment plan. Applies to new DMT starts and continuing DMT therapy
Fingolimod	Vaccines other than OxAZ  Vaccinate 4–6 weeks before starting OxAZ vaccine  1st dose 2–4 weeks before starting  2nd dose 3 months after starting	Vaccinate in the absence of other contraindications This applies to all COVID-19 vaccines
Anti-CD20	Vaccines other than OxAZ  Vaccinate 4–6 weeks before starting	Vaccines other than OxAZ  Vaccinate 4–5 months after last infusion  Delay the next dose by 6 weeks after full course of vaccineb
	OxAZ vaccine  1st dose 6 weeks before 1st infusion  2nd dose 4–5 months after next infusion, and ≥ 6 weeks before the following infusion	OxAZ vaccine  1st dose 4–5 months after last infusion and 6 weeks before next infusion  2nd dose 4–5 months after next infusion, and 6 weeks before the following Infusion
Alemtuzumab	Vaccines other than OxAZ  Vaccinate 4–6 weeks before starting OxAZ vaccine  1st dose 6 weeks before 1st infusion  2nd dose ≥ 3 months	Vaccines other than OxAZ  Vaccinate ≥ 3 months after starting treatment OxAZ vaccine  1st dose ≥ 3 months after the treatment course  2nd dose at least 6 weeks before other courses of alemtuzumab. The second course can be delayed for several months to facilitate advance scheduling of vaccination

OxAZ Oxford University/AstraZeneca vaccine against COVID-19

^aFor patients receiving ongoing treatment with cladribine tablets, it is preferred to vaccinate if the lymphocyte count is more than 500/mm³

^bNote that a given vaccine may require one or two doses (see Table 4)

Treatment of people with MS with fingolimod [59] or ocrelizumab [60] has been shown to blunt the response to vaccination. However, these patients were still able to develop a worthwhile immune response to vaccination. A case–control study reported adequate response to commonly used vaccines 1 month and 9–11 months after treatment with alemtuzumab [61]. Clinical experience with the new COVID-19 vaccines suggests that their efficacy in preventing severe adverse COVID-19 outcomes is greater than their ability to prevent uncomplicated, symptomatic infections [40] and even a blunted vaccine response may save your patient’s life: accordingly, vaccination of these patients should be carried out where possible, subject to due consideration of benefits and risks. Treatment with these DMTs should not be stopped or interrupted for vaccination (note also that withdrawal of fingolimod may provoke severe MS disease reactivation [62]). Vaccine doses should be scheduled before and after infusions of ocrelizumab.

For new starts on DMT therapy, we recommend a delay between completion of a course of vaccination (other than the OxAZ vaccine, see below) of 4–6 weeks before initiation of fingolimod or an anti-CD20 DMT, in order to allow the immunological response to vaccination to develop fully (Table 5). Vaccination of patients who have received alemtuzumab should occur when white blood cell counts have returned to the normal range (Table 5).

The OxAZ vaccine differs from other vaccines for COVID-19 in that a pre-specified analysis of its phase 3 programme demonstrated substantial (and increasing) immunity against COVID-19 for the 3 months following the initial dose [63]. These data confirmed that extended interdose intervals are safe and effective for this vaccine, providing an opportunity to vaccinate either side of a first or subsequent treatment with anti-CD20, or alemtuzumab, thus minimising the delay in initiating DMT therapy or the course of an ongoing DMT regimen (Table 5). These recommendations provide a pragmatic compromise between facilitating vaccination against COVID-19 and minimising disruption of DMT-based therapy to maintain protection against MS relapses and progression of disability.

Overall, current evidence and guidance is clear that vaccination is likely to produce worthwhile immune responses during treatment of MS with a DMT, that the risk of harm from vaccination of a patient with MS is negligible, that the benefits of vaccination clearly outweigh any risks, and that people with MS should receive a vaccination against COVID-19 where possible [50, 51]. The labelling for DMTs used in MS care will need to be updated with specific information on vaccination against COVID-19 as soon as more data are available.

Summary and future perspectives

Box 1 provides a summary of our recommendations regarding the management of patients with RMS during the COVID-19 pandemic, and regarding the deployment of vaccination against COVID-19. We have not used formal consensus procedures, nor formal grading of evidence or strength of recommendations. This is a limitation of our approach, but these are pragmatic recommendations based on expert opinion in light of the limited and incomplete data available at this time.

Box 1.

Summary of recommendations

MS and COVID-19

•MS is not a risk factor per se for severe adverse COVID-19 outcomes

•Caution is needed where patients have advanced disability or a progressive phenotype

•Be aware that patients with MS may have risk factors for adverse COVID-19 outcomes (e.g. obesity, older age, some comorbid conditions)

•DMT-based therapy in the COVID-19 era

•DMT-based care appears generally safe for patients with MS who develop COVID-19 (there may be increased risk of adverse outcomes with anti-CD20 therapy, which requires confirmation)

•It is unlikely that interferon-β, teriflunomide, dimethyl fumarate, glatiramer acetate, fingolimod, natalizumab or cladribine tablets will increase the risk of COVID-19

•Existing DMT therapy may be continued (consider 6-weekly dosing interval for natalizumab if MS disease activity is well controlled)

•All currently available DMTs except alemtuzumab can be started safely at this time; initiate alemtuzumab subject to careful individual risk–benefit considerations

Vaccination against COVID-19

•All COVID-19 vaccines appear to be safe for use in people with MS

Vaccination against COVID-19 will reduce the risk of catching the disease, or will at least lessen the risk of severe disease

•Stopping or delaying DMT is unlikely to boost vaccine responses and will leave patients at risk of COVID-19 when the risk of infection is highest

•Stopping or delaying DMT also leaves patients at risk of MS disease progression, especially DMT-naïve patients and/or patients with high MS disease activity

•Increased body temperature in the setting of febrile diseases can be associated with exacerbation of MS symptoms: preventing COVID-19 infection through vaccination may in theory help here

•Vaccinate while starting/continuing treatment with interferon-β, teriflunomide, dimethyl fumarate, glatiramer acetate, fingolimod, natalizumab and cladribine tablets—there is no need to alter the regimen for these DMTs while vaccinating, subject to lymphocyte counts (see below)

•Fingolimod, alemtuzumab or anti-CD20 agents may reduce the efficacy of a vaccination; however, even a blunted vaccine response is likely to protect them against severe COVID-19

Do not withdraw fingolimod or natalizumab: this may induce reactivation MS disease activity

•Vaccinate fully up to 6 weeks before initiating DMTs that act by continuous immunosuppression (fingolimod, anti-CD20 or alemtuzumab): a longer interdose interval may be used for the OxAZ vaccine to accommodate dosing regimens for these DMTs

•Educate patients (and other healthcare professionals) on the benefits of vaccination

OxAZ Oxford University/AstraZeneca COVID-19 vaccine

See text for rationale and supporting references. Recommendations on DMT or vaccination assume no contraindications to these interventions

RMS has not emerged as a risk factor for severe adverse COVID-19 outcomes per se, although patients with more advanced disability and a progressive MS phenotype seem to be at higher risk. Importantly, treatment with a DMT and vaccination against COVID-19 appear to be safe in people with MS, on the basis of the data we have today, and we have provided a pragmatic series of suggestions for dovetailing vaccination with DMT-based MS care. Precise practices regarding vaccination of people with MS on different DMTs will be refined as more clinical data become available. It is important to remember that risk factors for severe adverse COVID-19 outcomes (e.g. obesity, older age, male gender, some comorbid conditions) will be present in many patients with MS. Vaccinating these patients, in particular, against COVID-19 is an important clinical priority.

Education of the public will be crucial to maximise uptake of vaccines against COVID-19. This includes healthcare professionals: a recent survey from Saudi Arabia found that half of a population of 763 “healthcare workers” (otherwise undefined) would not accept vaccination as soon as a vaccine became available [64], a proportion almost identical to that from the general population [65]. Perceived concerns over the level of demonstration of safety for the vaccines were important here. This “vaccine hesitancy” has also been noted in populations of patients with MS, as there has long been an unfounded concern that vaccination may exacerbate MS [66, 67]. Indeed, it has been suggested that, as infections and fever are known to bring on MS relapses, prevention of febrile infections might improve the overall course of MS [66].