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. 2020 Dec 23;60(2):103043. doi: 10.1016/j.transci.2020.103043

The use of convalescent plasma for pediatric patients with SARS-CoV-2: A systematic literature review

Marco Zaffanello a,*, Giorgio Piacentini a, Luana Nosetti b, Massimo Franchini c
PMCID: PMC7834628  PMID: 33388249

Abstract

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is the virus that causes coronavirus disease 2019 (COVID-19), a severe illness leading to pneumonia, multiorgan failure, and death. With this study, we performed a systematic review of the literature and ongoing clinical trials on convalescent plasma therapy in pediatric patients with COVID-19. The electronic databases Medline PubMed, Scopus, and Web Of Science were searched. Also, clinical trials registries were searched for potentially eligible studies. A total of 90 records were retrieved after duplicate removal. Eight studies were case reports of children treated with convalescent plasma therapy (14 children, age range, 9 weeks to 18 years); 5 children had a chronic disease. During the hospital stay, 5 received drugs (e.g., remdesivir) in addition to convalescent plasma therapy. No convalescent plasma therapy-related adverse events were reported in 5 studies and 3 made no mention of adverse events. Seven studies concluded that convalescent plasma therapy is or could be a useful therapeutic option; one study made no claims. Only 3 of the 13 retrieved trials underway were planned exclusively for children. This is the first systematic review of the literature regarding convalescent plasma therapy for COVID-19 in children. We found insufficient clinical information on the safety and efficacy of convalescent plasma therapy in children. Nevertheless, the positive outcomes of the few case reports published to date suggest that convalescent plasma therapy may be of potential benefit. Further research with well-designed and powered clinical trials is needed.

Abbreviations: CPT, convalescent plasma therapy; RBD, receptor-binding domain; RT-PCR, real-time reverse transcription-polymerase chain reaction

Keywords: Children, COVID-19 pandemic, Plasma, SARS-CoV-2

1. Introduction

The outbreak of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) originated in the city of Wuhan in Hubei province, China, in late 2019. This virus is the cause of coronavirus disease 2019 (COVID-19), a severe illness characterized by pneumonia with increased infiltration of inflammatory cells and higher levels of pro-inflammatory cytokines (cytokine storms). Such events may lead to acute pulmonary injury, acute respiratory distress syndrome (ARDS), multiorgan failure, and ultimately death [[1], [2], [3]]. During the first three months of 2020, SARS-CoV-2 infection began to spread worldwide. It was finally classified by the World Health Organization (WHO) as a Public Health Emergency of International Concern. At the time of writing, nearly 50 million people have been infected by the virus and approximately 1,25 million have died (WHO. Coronavirus disease [COVID-19] outbreak, accessed 09/11/2020) [4]. The median age of patients who died due to severe COVID-19 during the first pandemic wave (March-June 2020) was 78 years (interquartile range [IQR], 67–87), according to the U.S. Centers for Disease Control and Prevention (CDC) [5]. Patient age progressively declined over the summer months due to the lack of adoption by younger individuals of minimum preventive measures (use of masks and social distancing) [5]. Even with the decreasing age of symptomatic COVID-19 patients during the second pandemic wave, symptomatic cases among children remain rare for still largely unknown reasons. Nonetheless, cases of multisystem inflammatory and Kawasaki syndrome in children and adolescents have been reported [6].

While there are various treatment options for SARS-CoV-2, no effective vaccine or drug against the virus is currently available [7]. Passive immunotherapy using hyperimmune convalescent plasma (HCP) from SARS-CoV-2 recovered donors has been largely explored [[8], [9], [10]] and reviewed [11]. Previous RCTs in adults with COVID-19 infection did not show any beneficial effects of CP [[12], [13], [14], [15]]. In addition, a Cochrane review supports uncertainty about the safety and efficacy of therapy in COVID-19 adults with CP [11]. Unfortunately, little data for the pediatric population exist. To fill this gap, we conducted a systematic review the literature and ongoing clinical trials on the use of HCP in pediatric patients with COVID-19 infection.

2. Methods

2.1. Search strategy

The electronic databases Medline PubMed Advanced Search Builder, Scopus, and Web Of Science were searched (until November 1, 2020) using medical subject headings (MeSH) terms and text words (their combinations and truncated synonyms) as appropriate: [HYPERIMMUNE PLASMA or CONVALESCENT PLASMA] and [PEDIATRIC OR CHILD] and [COVID-19 or SARS-COV-2]. When available articles were retrieved, the abstracts were screened after removal of duplicate articles. The full text was analyzed and the references were screened for further articles missed in the primary search. This review is not limited to the geographical area or gender. Inclusion criteria were: children with COVID-19 (or SARS-COV-2), in which convalescent plasma (or hyperimmune plasma) was used as treatment. Studies reporting the results of controlled trials, case-control studies, cohort studies, with synthesized data were included. The search was limited to articles published in English. Exclusion criteria were: studies published only as abstracts, letters or conference proceedings, discussion papers, animal studies, or editorials. Initial screening of titles identified potentially relevant studies, followed by screening of abstracts and then full-text review. All titles and abstracts were independently evaluated by two reviewers (MZ, MF), not blinded to authors, journals, results for consistency of inclusion/exclusion and any disagreement was solved by consensus. If the two review authors did not reach an agreement, a third review author was consulted to solve disagreement. No ethical approval was required for this study.

2.2. Study review and data extraction

Two independent reviewers (MZ, MF) evaluated the articles potentially meeting the inclusion criteria and retrieved the full text. Studies that did not fulfil all inclusion criteria were excluded; reasons for exclusion are reported. Table 1 presents the articles excluded from the review because not pertinent to the present study. Full texts were screened, and bibliographic details, as well as data regarding study design, participants, disease severity, intervention, and outcomes were recorded on predefined forms. When data from the same cohort were presented in more than one article, only the reports that most directly evaluated therapy with convalescent plasma (or hyperimmune plasma) and COVID-19 (or SARS-COV-2) in children (age, 0–18 years) [16] were included. All data, numerical calculations, and graphic extrapolations were independently confirmed. We did not deal with missing data. Due to the lack of study homogeneity, a narrative synthesis of the results was conducted.

Table 1.

Characteristics of case reports of children treated with convalescent plasma.

Author
(year)
Design Country Case study Comorbidity Clinical condition Diagnostic approach Treatment Reason for CP* treatment Outcome Comments
Jin H., et al. (Sep 2020) [20] Case report USA Case 1−10-year-old male;
excluded: Case 2−24-year-old man; Case 3−40-year-old man
Hereditary spherocytosis + X-linked agammaglobulinemia (XLA) Initial symptoms: 10 dys before hospitalization; chest X-ray: right middle and lower lobe infiltrates At admission: negative naso-pharyngeal swab RT-PCR;***
day 19: positive bronchoalveolar lavage RT-PCR***
10-day course of remdesivir;
2 units 200 mL unmixed ABO-compatible CP* (days 22 and 23)
Minimal improvement on supportive therapies Recovered after receiving CP* (6 dys). CPT may help neutralize virus, shorten duration of illness, also in later stages of COVID-19
Figlerowicz M, et al. (July 2020) [21] Case report Poland 6-year-old girl Aplastic anemia with severe pancytopenia Hepatomegaly and bilaterally enlarged kidneys;
COVID-19-associated severe aplastic anemia
RT-PCR*** test on nasopharyngeal swab. IVIG, lopinavir-ritonavir (10 mg + 2.5 mg twice daily).
At 5 wks: CP* with antibodies against IgG titer 1:700 once in a 200 mL/dose
Poor effect of treatment: IVIG, lopinavir-ritonavir + steroid Negative SARS-CoV-2 RNA in nasopharyngeal swabs (3 wks);
hematologic parameters (pancytopenia) did not improve;
no adverse events
In patients with pancytopenia, transfusion of CP* could be an option
Shankar AU, et al. (2020) [22] Case report India 4-year-old girl Acute lymphoblastic leukemia Chest X-ray: bilateral fluffy opacities; hypoxia with increasing oxygen requirement to 7 L/min with face mask RT-PCR*** for SARS-COV-2 RNA from nasopharyngeal swab CP* 15 mL/kg on day 8 and 9.
Lopinavir-ritonavir and remdesivir
dexamethasone (0.2 mg/kg) and IVIG (1 g/kg)
Children with cancer (high-risk population);
severe COVID-19 associated pneumonia
Remarkable improvement with reduction in respiratory rate, work of breathing and oxygen requirement (10 dys)
No transfusion reaction
Positive outcome following use of IVIG, steroids and CP* alone
Schwartz SP, et al. (Oct 2020) [17] Case report (n = 4) USA 1) 15-year-old obese Hispanic male;
2) 16-year-old obese Asian male;
3) 5-year-old Hispanic female;
4) 12-year-old obese Hispanic female
None Acute respiratory failure requiring high-flow nasal cannula (HFNC) at admission Anti-SARS-CoV-2 antibodies targeted to RBD** of SARS-CoV-2 spike protein CP* units transfused:
Case 1) no. 2 (RBD** binding titer 1:160; same donor); Remdesivir. IV anakinra.
Case 2) no. 2, 10 mL/kg (titer unknown). remdesivir.
Case 3) no. 2 (separate donors; titer 1:1,280). remdesivir
Case 4) no. 2 (titer: Unit 1 = 1: 2,560, Unit 2 = 1:640). remdesivir. IV methylprednisolone
CPT* as a treatment strategy for severe disease Discharged home after CP*:
7 dys; 5 dys; 23 dys; 10 dys, respectively.
Off oxygen support.
4) binding titer: unit 1 = 1:2,560, unit 2 = 1:640
No adverse events
CPT* is feasible therapy for critically ill pediatric patients
Rodriguez Z, et al. (Sep 2020) [23] Case report USA 9-week-old female Trisomy 21; congenital heart disease Cardiopulmonary failure secondary to unrepaired congenital heart disease exacerbated by COVID-19 SARS-CoV-2 nucleic acid testing of nasopharyngeal swab Remdesivir (5 mg/kg)
2 aliquots of CP* from 2 donors (10 mL/kg per aliquot; donor no. 1 had IgG titer 1:12724 and neutralizing titer 1:126; donor no. 2 had IgG titer 1:816 and neutralizing titer 1:50) from 2 COVID-19 recovered donors
Deteriorating clinical status because lack of response to remdesivir (5 mg/kg per day) on hospital day 15 and 2.5 mg/kg per day on hospital days 16−25). Uneventful complete recovery (47 dys) CP* may be safe and effective treatment option in SARS-CoV-2 infection refractory to remdesivir.
Diorio C, et al (Sep 2020) [18] Case report USA N = 4 patients, 14–18 years old; CD4, CD15, CD17, CD25# None Intubation and ventilation;
two required extracorporeal membrane oxygenation
RT-PCR*** testing of respiratory tract mucosa Patient CD4 received CP* 2 mL/kg
Patients CD15, CD17, CD25 received CP* 4 mL/kg (RBD**-specific antibody titer levels <1:160)
Life-threatening COVID-19-associated respiratory disease Donor for patient CD25# had higher SARS-CoV-2 RBD** antibody titers (>1:6000) than donor for other patients; no adverse event CP* may be of greatest benefit early in illness
Greene AG, et al (Jun 2020) [19] Case report USA 11-year-old female None Toxic shock-like syndrome; LV systolic function mildly decreased based on decreased shortening fraction RT-PCR*** positive for SARS-CoV-2 Furosemide, enoxaparin, tocilizumab, CP*, remdesivir, steroids, IVIG Signs of distributive shock, multi-organ injury, systemic inflammation associated with COVID-19 Improved dramatically (24 h) Close follow-up for children presenting with fever lasting 3 dys
Balashov D, et al. (Nov 2020) [24] Case report Russia 9-month-old girl Juvenile myelomonocytic leukemia; hematopoietic stem cell transplantation Polysegmental bilateral viral pneumonia with 60 % damage of lung tissue RT-PCR***, throat swab positive for SARS-CoV-2 on day 99 after hematopoietic stem cell transplantation Tocilizumab (10 mg/kg), CP* (10 mL/kg; 3 doses; titers 1:160, 1:160 and 1:80) Secondary immunodeficiency Full resolution of lung lesions;
complete elimination SARS-CoV-2 4 mths after first detection
CT* well tolerated
SARS-CoV-2 CP* in combination with other therapeutic approaches possible curative options

Legend: *CP denotes convalescent plasma; **RBD receptor-binding domain; ***RT-PCR real-time reverse transcription-polymerase chain reaction; #antibody titers expressed as reciprocal serum dilution against SARS-CoV-2 antigens in four children.

2.3. Ongoing trials involving pediatric patients

We searched the clinical trials registries (censored 5th November 2020) for eligible studies under way or planned to investigate the use of CPT for COVID-19 infection in children. The six online databases used for this research were https://clinicaltrials.gov/; https://eudract.ema.europa.eu/; https://www.clinicaltrialsregister.eu/; https://www.who.int/ictrp/network/en/; http://www.chictr.org.cn/abouten.aspx; https://www.irct.ir/.

3. Results

The initial search yielded 90 records as detailed in the PRISMA flow diagram (Fig. 1 ). Further screening of abstracts excluded 74 records unrelated to the topic (n = 22), unrelated reviews (n = 18), related reviews (n = 14; in childhood n = 6), commentaries or letters (n = 11), guidelines (n = 3), unrelated studies involving children, and studies not published in English (n = 2), and protocol (n = 1). Eight of the remaining 16 full-text records were excluded because the study population was adults (Supplementary Table 1). The 8 other records were case reports involving 14 children. The study population ranged in size from 1 to 4 children (age, 9 weeks to 18 years). Table 1 presents the characteristics of the studies included in the final review. Three case reports included patients (n = 9) without comorbidity [[17], [18], [19]]; 5 reported on patients (n = 5) with a comorbid condition: one each with agammaglobulinemia [20], aplastic anemia and severe pancytopenia [21], acute lymphoblastic leukemia [22], trisomy 21 with congenital heart disease [23], and juvenile myelomonocytic leukemia [24].

Fig. 1.

Fig. 1

PRISMA 2009 Flow Diagram.

Clinical conditions at admission before treatment were severe, including pneumonia [20,22,24], respiratory failure [17,18], and (multi)organ failure [21,23,19]. Among the additional drug treatments administered during hospital stay, the most frequent was remdesivir (n = 5) [20,22,17,23,19]. Five case reports described the use of CP antibodies against SARS-CoV-2 IgG [21,17,23,18,24], whereas 3 did not [20,22,19]. No CPT-related adverse events were reported in 5 studies [21,17,18,24,22], and 3 studies made no mention of adverse events [20,23,19]. Patient outcomes were reported as recovery and/or discharge from hospital (n = 6) [20,22,17,23,19,24] or as amelioration of markers of SARS-CoV-2 infection [21,18]. Based on clinical observations, 2 case reports concluded that CPT is a useful option [22,17], 5 concluded that it could be a useful choice [20,21,23,18,24], and 1 case report made no statement [19].

Table 2 presents the ongoing and planned clinical trials (n = 13). Most are registered in the United States (n = 8), followed by the UK (n = 2), Canada, Pakistan, and Brazil. Ten involve both pediatric and adult populations [[25], [26], [27], [28], [29], [30], [31], [32], [33], [34]]. One trial did not state the upper limit of age at enrollment [29]. Finally, 3 trials are planned specifically to involve children (total of 160 participants), 2 in the United States [35,36] and 1 in Canada [37]. Two trials are currently in Phase 1 [35,36] and 1 trial is in Phase 2 [37] (total of 160 participants). The unit of measure of CP infusion is defined as “Unit” (200−250 ml) in 1 trial and as dosage per kg of body weight (5–10 ml/kg) in 2 trials.

Table 2.

Characteristics of ongoing clinical and preclinical trials of convalescent/hyperimmune plasma treatment against COVID-19 (updated on November 05, 2020).

Trial no. Country Objective Design Phase(s) Last update Indication Age Eligible for Study Study population Schedule Donor titer
NCT04377672 [35] USA Safety of CP* administration; prevent or lessen disease severity Interventional (clinical trial) Phase 1 June 2, 2020 High risk of developing COVID-19 due to recent exposure 1 mth - 18 yrs 30 1−2 unit (200−250 mL per unit) of CP* >1:320
NCT04377568 [37] Canada CP* for hospitalized children Multicenter, open-label, randomized controlled trial Phase 2 October 8, 2020 Hospitalized with COVID-19 illness < 18 yrs 100 One infusion of CP* 10 mL/kg, up to a maximum of 500 m L
NCT04462848 [36] USA Safety and pharmacokinetics Interventional (clinical trial); single group assignment) Phase 1 July 8, 2020 Cardiovascular disease, lung disease, immunosuppression 1 mth - 17 yrs 30 CP* 5 mL/kg. Maximum volume 500 m L
NCT04352751 [34] Pakistan Real-life setting clinical data in local population; evidence-based management of disease condition Interventional (clinical trial) Not Applicable September 29, 2020 Severe or critical illness 18−55 yrs (adults) 2000 Children: CP* 15 ml/kg if <35 kg body weight.
Adults: CP* max 450 - 500 ml once in all adults.
NA
NCT04360486 [25] USA Treatment option for patients with severe COVID-19 infection Expanded access open-label, single-arm, multi-site protocol April 27, 2020 Severe or life-threatening Child, adult, older adult
NCT04374370 [26] USA Expanded access to CP* May 5, 2020 Severe Acute Respiratory Syndrome 6−99 yrs
NCT04458363 [27] USA Safety of CP* for children Interventional (clinical trial); randomized Early Phase 1 July 7, 2020 Severe COVID-19 disease <22 Yrs (child, adult) 50 10 mL/kg/dose (up to 2 units per dose); two doses per patient for a total dose of 20 mL/kg
NCT04528368 [28] Brazil Efficacy and safety of CP* Interventional (clinical trial) Phase 2 August 27, 2020 No indication of ventilatory support Child, adult, older adult 60 400 mL of CP* ≥ 1: 320
NCT04361253 [29] USA Early addition of CP* to standard treatment improves clinical outcome Prospective randomized, double-masked, placebo-controlled trial Phase 3 May 18, 2020 Active COVID-19 infection in hospitalized patients Age >1 yr 220 250 mL, max500 mL
NCT04376034 [30] USA Help fight infection in patients with COVID-19 Interventional (clinical trial), non-randomized, prospective Phase 3 May 6, 2020 Mild, moderate and severe/critical severity 31 dys and older 240 10 mg/kg up to 2 units of CP*
NCT04381936 [31] UK Prevention of death in patients with COVID-19 Randomized trial Phase 3 September 29, 2020 Patients with COVID-19 in hospital care Child, adult, older adult 15,000 275 ml ± 75 ml per day on study days 1 and 2 (minimum 12-h interval)
NCT04349410 [32] USA Fleming method for tissue and vascular differentiation and metabolism Randomized trial Phase 3 October 29, 2020 Patients with COVID-19 Child, adult, older adult 1800 CP* 2-units infused over 4-h 1:320
ISRCTN50189673 [33] UK To compare several different treatments potentially useful for patients with COVID-19 Interventional, randomized adaptive trial Recruiting October 06, 2020 COVID-19 (clinically suspected or laboratory-confirmed), and in hospital Child, adult

Legend: * CP denotes convalescent plasma.

4. Discussion

This is the first systematic review of the literature investigating CPT for COVID-19 in children. All children had serious COVID-19, some with severe concomitant conditions and treated with various drugs. Most studies reported no CPT-related adverse events. We found insufficient information to compare the evidence for the efficacy of CPT. Among the registered clinical trials (mainly with clinicaltrials.gov), very few have been designed exclusively for children. The broad clinical interest in this vulnerable patient subpopulation is scarce.

The prevalence of COVID‐19 in children and adolescents is relatively low, accounting for about 2.4 % of all reported cases [38]. Although most children rarely progress to severe disease, there is concern for an inflammatory cascade [39]. Between January and June 2020, 55,270 children/adolescents diagnosed with and 3,693 hospitalized for COVID-19 were included in a large-scale multinational cohort study. While the mortality rate due to COVID-19 is negligible in this age group, complications including pneumonia, ARDS, and multisystem inflammatory syndrome should not be underestimated [40]. Early identification of COVID‐19 and prompt treatment are essential, especially in children with underlying/comorbid disease(s) [38].

Our review revealed a wide range of medications for the inpatient management of pediatric COVID-19. An international network cohort study, performed in children/adolescents diagnosed with and/or hospitalized for COVID-19 at age <18 years, reported a variety of adjunct therapies: systemic corticosteroids (6.8 %), famotidine (9.0 %), antithrombotic therapy, antibiotics, and immunoglobulins [40].

The U.S. Food and Drug Administration (FDA) approved remdesivir for emergency use in children hospitalized with severe suspected or laboratory-confirmed COVID-19 [41]. Parenteral remdesivir has been approved by the European Medicines Agency for pediatric and adolescent patients (≥12 years, body weight ≥40 kg), and has shown potential benefits [42]. Some limitations may regard neonatal intensive care unit (NICU) and pediatric intensive care unit (PICU) patients with severe disease (mechanical ventilation or extracorporeal membrane oxygenation [ECMO]).

CPT can be administered in children with rapid exacerbation of conditions and those with severe and critical diseases [43]. However, the currently available scientific literature is limited to case reports. Research providing higher quality evidence for the efficacy and safety of CPT in the treatment of pediatric COVID-19 infection has been planned [44] or is still in the protocol phase.

The main limitations and biases of the present study are that it includes only clinical case reports. Another bias (bias of reporting) is that only cases with a positive outcome have been reported, precluding representativeness of the whole pediatric population treated with CP.

5. Conclusions

Although COVID-19 is rare in childhood, children with chronic illness are vulnerable and may require treatment. We found no high quality studies investigating the efficacy and safety of CPT for COVID-19 in children and adolescents. Although available reports in pediatric age are case reports and case series (reporting bias), they have the potential to stimulate future research based on well-designed and powerful studies.

Funding source

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

CRediT authorship contribution statement

Marco Zaffanello: Conceptualization, Data curation, Writing - original draft. Giorgio Piacentini: Supervision, Validation, Writing - review & editing. Luana Nosetti: Data curation, Investigation, Writing - original draft. Massimo Franchini: Writing - original draft, Methodology, Writing - review & editing.

Declaration of Competing Interest

None.

Footnotes

Appendix A

Supplementary material related to this article can be found, in the online version, at doi:https://doi.org/10.1016/j.transci.2020.103043.

Appendix A. Supplementary data

The following is Supplementary data to this article:

mmc1.docx (38.9KB, docx)

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