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. 2014 Mar 7;6:ecurrents.outbreaks.e4df88f057fc49e2560a235e0f8f9fea. [Version 1] doi: 10.1371/currents.outbreaks.e4df88f057fc49e2560a235e0f8f9fea

Outbreak of Skin Infections Due to Panton-Valentine Leukocidin-Positive Methicillin-Susceptible Staphylococcus aureus in a French Prison in 2010-2011

Céline Bourigault 1, Stéphane Corvec 2, Virginie Brulet 3, Pierre-Yves Robert 4, Olivier Mounoury 5, Chloé Goubin 6, David Boutoille 7, Bruno Hubert 8, Michèle Bes 9, Anne Tristan 10, Jérôme Etienne 11, Didier Lepelletier 12
PMCID: PMC3946008  PMID: 24619564

Abstract

Background. An outbreak of PVL-positive MSSA skin and soft tissue-infections (SSTIs) was suspected in May 2010 when recurrent SSTI was diagnosed in an inmate of a large prison in Nantes, France. Methods and findings. Retrospective and prospective investigations were performed. Microbiological characterisation was by DNA microarray testing (S. aureus genotyping - Identibac, Alere). We identified 14 inmates meeting our clinical and microbiological case definition for PVL-MSSA SSTI between March 2010 and April 2011. The SSTIs developed in tattooed areas in 4 patients and in areas shaved daily with a mechanical razor in 4 other patients. All case isolates exhibited a similar SmaI pulsed-field gel electrophoresis pattern. Microarray analysis showed that all 14 isolates harboured genes encoding PVL and enterotoxins (A, H, K, and Q) and belonged to clonal complex 1 (CC1). Individual and collective hygiene measures, education delivered to inmates and prison employees, and antibiotic treatment of SSTIs were successful in controlling the outbreak. No new cases were identified after April 2011. Routine screening for PVL-positive MSSA carriage was not feasible. Conclusions. Our data suggest that tattooing and shaving with mechanical razors may constitute risk factors for SSTIs among previously colonised inmates and contribute to the PVL-MSSA outbreak in the prison. Allowing inmates access to professional tattooists and to the hygiene and safety conditions available to people in the community would help to prevent tattoo-related infections.

Introduction

Staphylococcus aureus commonly resides as a commensal on human skin and mucous membranes. Thus, asymptomatic cutaneous and nasal S. aureus carriage is found in about one-third of healthy individuals.1 However, S. aureus can cause infections ranging from minor skin and soft-tissue infections (SSTIs) to life-threatening pneumonia or toxin-mediated diseases. Panton-Valentine leukocidin (PVL) production by S. aureus is associated with both SSTIs and severe infections such as necrotizing pneumonia. 2 , 3 , 4 PVL can be produced by both methicillin-susceptible S. aureus (MSSA) and methicillin-resistant S. aureus (MRSA) strains.2 , 5 PVL-producing S. aureus strains are typically acquired in the community by healthy young children or adults. Community-acquired infections with PVL-producing S. aureus, most notably MRSA strains, have been documented in a broad range of defined populations such as children, native Americans, members of athletic teams, military recruits, and prison inmates.6 , 7 , 8 , 9 Here, we report the investigation of a PVL-MSSA outbreak in a prison, as well as the measures that were successful in stopping the outbreak. In May 2010, a PVL-MSSA strain was identified at the Nantes University Hospital laboratory in an inmate of the Nantes prison evaluated for recurrent SSTI. The infection-control team was alerted when a laboratory database search identified additional cases. An investigation was carried out jointly with the local and national health authorities and the prison authorities. Several measures were then taken to control the outbreak.

Methods

Setting. The prison is in Nantes, a city of north-western France with a population of about 500,000. Most of the 440 male inmates serve lengthy terms. There are five cellblocks (A, B, C, D, E), including a maximum-security section, and 330 employees. In the prison, a medical centre that is an outreach component of the Nantes University Hospital emergency department provides outpatient care to inmates. Microbiological samples from inmates are sent to the bacteriology and hygiene department of the Nantes University Hospital. The inmates have daily free access to common areas (e.g., gym, library, and common room) and share bathrooms. Meals must be taken in the cells.

Definitions of cases and outbreak period. We used a clinical and microbiological definition to describe the outbreak. The index case was an inmate who had an SSTI in early 2010 followed by a recurrence in May 2010. This recurrence prompted tests for the PVL toxin. The laboratory database was searched to identify all S. aureus isolates from soft-tissue lesions sampled between January 2006 and June 2010. Inmates with PVL-positive MSSA SSTIs during the study period were defined as cases; inmates with PVL-negative MSSA SSTIs were not cases.The outbreak period was defined as the period between the first and last PVL-positive MSSA SSTIs.

Prospective clinical and microbiological surveillance. Starting in July 2010, all inmates with suspected SSTIs were encouraged to seek advice from the prison healthcare professionals. Microbiological documentation of all SSTIs was obtained via clinical sample collection for PVL-MSSA testing. For each inmate with a PVL-positive MSSA SSTI, a prison healthcare professional completed a questionnaire to collect clinical and epidemiological data. The number of inmates without SSTIs and prison employees was too large to allow routine screening for PVL-MSSA colonisation.

Evaluation of high-risk behaviours in inmates. Exposures were initially evaluated among inmates during the medical consultation for the management of SSTIs. In a more general way, high-risk behaviours were evaluated in a specific survey among all inmates who presented at the prison medical center in March 2011. The interviews were conducted by prison healthcare professionals after informed consent of the inmates. The prevalences of tattooing and body shaving with razors were estimated. We decided not to evaluate sexual practices and drug taking behaviours.

Microbiology. Swabs of the SSTI lesions were incubated overnight on blood agar (bioMérieux, Marcy-l'Etoile, France) at 37°C. Suspected colonies were confirmed as S. aureus using PastorexTM Staph-Plus (BioRad, Marnes-la-coquette, France). PVL screening was by polymerase chain reaction (PCR) and confirmation testing was performed by the French National Reference Centre for Staphylococci.10 , 11 Genotyping of each isolate was achieved using a DNA microarray test (S. aureus genotyping – Identibac; Alere Technologies GmbH, Jena, Germany) according to the manufacturer’s instructions. Relatedness among all S. aureus isolates was investigated by pulsed-field gel electrophoresis analysis using SmaI digestion, as described elsewhere,10 and was interpreted according to Tenover et al.12 Pulsed-field gel electrophoresis profiles were analysed using Bionumerics software (Applied Maths, Sint-Martens-Latem, Belgium).

Infection control program. The inmates received instruction about the benefits of frequent hand washing, regular but not excessive bathing/showering, not sharing personal items (e.g., towels and razors), and cleaning their cells frequently. Both the inmates and the employees received information on helpful behaviours such as placing a towel or item of clothing between the skin and shared equipment in collective facilities (e.g., the gym), cleaning shared facilities and equipment frequently with disinfectant products (only detergents were used before the outbreak), use by employees of alcohol hand rubs (inmates were not allowed to use products containing alcohol), and banning patients with active SSTIs from the gym. Flyers providing information on infection control were distributed throughout the prison and posters were put up in all five cellblocks and in the library and cafeteria. Each SSTI patient was given specific guidelines on minimising the risk of dissemination.

Management of SSTIs. Inmates with SSTIs were given oral amoxicillin-clavulanate, 3 g/day for 10 days. They took the antibiotic themselves in their cells. Incision and drainage were performed if needed. The lesions were covered with clean dry dressings. For nasal MSSA decolonisation, mupirocin was applied to the nares twice a day for 5 consecutive days starting 1 week after SSTI resolution. In addition, the patients showered daily with chlorhexidine soap. Recurrent SSTIs were managed with oral clindamycin, 1.8 g/day for 10 days, and nasal decolonisation. After nasal decolonisation, routine screening for nasal MSSA carriage was not performed.

Ethics statement. The study has been approved by the French Ministries of Health and of Justice and by the National Health Institute. The methodology of the investigation in the jail was also approved by the National Department of Health Emergency. Systematic oral consent was obtained from prisoners and archived in all medical records.

Results

Outbreak investigation and characteristics of patients and SSTIs. The index case was identified in late May 2010 when he was diagnosed with recurrent SSTI due to a PVL-positive MSSA. This inmate was incarcerated in November 2006. He had a facial abscess in February 2010 followed, in May 2010, by a subcutaneous abscess of the right armpit, at the site of a cut caused by a razor. He tried to drain both abscesses by puncturing them with flamed needles. He had inflammatory psoriasis with multiple excoriations. The retrospective database search identified three further PVL-positive and six PVL-negative MSSA strains recovered from soft-tissue lesions between January 2006 and June 2010 (Figure 1). Prospective surveillance identified ten additional PVL-positive MSSA SSTIs between July 2010 and April 2011 (Figure 1). No new cases were detected after April 2011; after this date, all SSTIs were caused by sporadic PVL-negative MSSA strains.The characteristics of the 14 cases are detailed in Table 1. Median age was 41 years (inter-quartile range [IQR], 33-43). Median time from incarceration to the first PVL-positive MSSA culture was 48 months (IQR, 17-82). The 14 patients represented all five cellblocks. Of the 6 patients with recent tattoos, 4 developed SSTIs in the tattoo area within the following 3 weeks. The 4 patients who shaved their body daily with mechanical razors had SSTIs in the shaved areas. Two other patients had SSTIs in the vicinity of previous skin lesions (psoriasis and vascular ulcer, respectively). Finally, two SSTIs occurred in the absence of previous skin lesions and initially resembled spider bites. Five patients experienced recurrences within a mean of 60 days (36-87 days) after initial antibiotic treatment and nasal decolonisation. Five patients were released from the prison during the outbreak. No prison employees experienced SSTIs during the investigation.

Microbiological analysis. All 14 case isolates exhibited a similarSmaIpulsed-field gel electrophoresis pattern (Figure 2). Microarray analysis showed that all 14 isolates harboured genes encoding PVL and enterotoxins (A, H, K, and Q) and belonged to clonal complex 1 (CC1). The 10 SSTIs diagnosed before and after the outbreak were caused by various PVL-negative MSSA strains (Figure 2).

Evaluation of high-risk behaviours in inmates. Of the 79 inmates seen at the prison medical centre in March 2011, 14 (18%) had tattoos performed during the outbreak (median per inmate, 4; range, 1-11) and 29 (37%) reported shaving their body with mechanical razors during the outbreak. All the tattoos were performed by the same 3 inmates. As French law prohibits tattooing in prisons, we were unable to interview these 3 inmates to evaluate their hygiene practices and equipment.

Epidemic curve of a PVL-positive methicillin-susceptible (MSSA) skin and soft-tissue infection (SSTI) outbreak in a French prison.

Epidemic curve of a PVL-positive methicillin-susceptible (MSSA) skin and soft-tissue infection (SSTI) outbreak in a French prison.

*Index case **Inmate believed to have introduced the epidemic strain in the prison

Microbiological alert : the infection control team was alerted by the bacteriology laboratory following the repeated isolation of PVL-positive MSSA isolates.

The x axis represents the date of PVL-toxin MSSA isolation from SSTIs.

Banding patterns determined by pulsed-field electrophoresis (PFGE) and dendrogram showing the genetic relatedness of 24 MSSA isolates recovered from inmates of the Nantes prison, France, in 2008-2011 (numbers 1 to 6 and 21 to 24: PVL-negative MSSA non-epidemic strains; numbers 7 to 20: PVL-positive MSSA epidemic strain).

Banding patterns determined by pulsed-field electrophoresis (PFGE) and dendrogram showing the genetic relatedness of 24 MSSA isolates recovered from inmates of the Nantes prison, France, in 2008-2011 (numbers 1 to 6 and 21 to 24: PVL-negative MSSA non-epidemic strains; numbers 7 to 20: PVL-positive MSSA epidemic strain).

graphic file with name Table-1.jpg

Table 1. Characteristics of the 14 inmates who experienced PVL-positive MSSA skin and soft-tissue infections during the outbreak at the Nantes prison, France, in 2010-2011.

Discussion

We report a fully investigated and controlled SSTI outbreak in a French prison. To our knowledge, no other outbreaks of PVL-positive MSSA SSTIs have been reported in European correctional-facility inmates.

We identified 14 cases of PVL-positive MSSA SSTIs. The actual number may be higher, since SSTIs were not sampled routinely before the introduction of the prospective clinical surveillance programme. Some inmates with SSTIs may have failed to seek assistance from the prison healthcare professionals, and others may have had SSTIs that were not sampled. The patient believed to have introduced the epidemic strain into the prison was incarcerated in 2008. We do not know whether he was colonised with this strain at the time. He had chronic inflammatory psoriasis but waited several months before seeking help from the prison healthcare professionals. His history of SSTI was identified during the outbreak, in July 2010, when he presented to the prison medical centre. His first skin abscess occurred in November 2008. He subsequently had skin abscesses or boils in February 2010 (abdomen), March 2010 (around the navel), April 2010 (sacrum), and July 2010 (abdomen and forearm). In July 2010, the lesions were incised and drained and samples were sent to the microbiological laboratory. The epidemic strain probably spread by skin-to-skin transmission, since the 3 patients identified in March and April 2010 were incarcerated in adjoining cells on the same floor of the same cellblock. All 3 patients worked in the collective areas, which may explain the spread of the epidemic strain to inmates from other cellblocks; isolating these 3 patients in their cells was deemed unethical, particularly as they were paid for their work. Furthermore, some of the inmates had activities associated with a risk of injuries (e.g., carpentry, cooking, or machining solid objects) that were potential portals of entry for micro-organisms. However, some of the SSTIs developed in healthy areas. Male-to-male sexual activity and intravenous substance abuse are common in prisons and can contribute to the transmission of S. aureus. We were unable to document these behaviours during our investigation.

A substantial proportion of the cases had tattoos or shaved their body with mechanical razors during the outbreak, suggesting that these practices may have promoted the transmission of S. aureus in previously colonised individuals. However, we had no data on colonisation prior to the outbreak. Of the 79 inmates interviewed in March 2011, 29 (37%) reported shaving their body every day with mechanical razors. This prevalence was not significantly higher than in the patients with SSTIs (4/14, 28%). The prevalence of tattooing during the outbreak was lower in the 79 interviewed inmates (14/79, 18%) than in the patients with SSTIs (6/14, 43%), but the difference was not statistically significant. However the sample size and the study design were not sufficient to make detecting a causal relationship between exposure to tatoo and PVL-toxin positive MSSA SSTI. It is simply a concomitant observation and most abscesses occurred in the weeks following a tattooing or skin shaving. That is why we discuss this hypothetis (skin lesion favoring sstaphylococcus inoculation) without being able to confirm or compare it with other risky practices (sexual practices and the use of intravenous drugs). But the chronology of observations was troubling and the incidence of abscesses significantly decreased following the decrease in the number of observed tattoos and the disappearance of the epidemic strain from April 2011. In a multicentre European study, about 20% of prison inmates had a lifetime history of receiving tattoos while incarcerated.13 Our sample sizes were too small to allow a case-control study of risk factors associated with PVL-positive MSSA SSTI; in addition, we had no data on the reservoir, since routine screening for PVL-MSSA colonisation was not feasible. A case-control study of male inmates in a Los Angeles county jail identified several risk factors for MRSA infection, many of which were pre-incarceration factors such as previous skin infection and low level of education;14 however, several risk factors were amenable to improvement, including showering frequency, knowledge about Staphylococcus, and soap sharing. Tattooing is known to be associated with infections due to bacteria -- including S. aureus -- or viruses.15 In correctional facilities, tattooing is performed by the inmates themselves, who generally have no specific training and use makeshift equipment.16 , 17 The equipment is not sterilised and is frequently shared among inmates. Skin infections related to tattooing usually develop within a few days or weeks. Allowing inmates access to professional tattooists and to the hygiene and safety conditions available to people in the community would help to prevent tattoo-related infections. The French National Authority for Health published new guidelines in 2012 to control the spread of infectious diseases in correctional facilities and recommend allowing professionals to perform tattoos for inmates in prison.18

The infection control strategies used during the outbreak were based on guidelines or experience described elsewhere and were adapted to meet local requirements.19 , 20 They were approved by local health authorities and by the French Ministries of Health and of Justice. These strategies were successful in controlling the spread of the PVL-positive MSSA strain, as no new cases were detected after April 2011. Most PVL-positive outbreaks reported in the US were due to MRSA strains.21 No MRSA strains were recovered during the outbreak studied here. However, earlier studies found no significant differences between inmates with MSSA and those with MRSA for age, gender, ethnicity, previous incarcerations, or co-morbidities.22 , 23 , 24 , 25 PVL-positive MSSA and PVL-positive MRSA strains are probably similar regarding their ability to spread and to cause invasive disease in incarcerated populations. During the outbreak, most of the cases had several episodes of PVL-positive MSSA SSTIs, in keeping with data on MRSA SSTIs in inmates.25 The spread of epidemic strains causing recurrent SSTIs may be related to the PVL toxin, although no significant associations have been reported between illness severity or dissemination potential and presence of PVL genes.26 , 27 The present outbreak constitutes additional evidence that PVL-positive MSSA strains can cause recurrent invasive infections, in contrast to PVL-negative MSSA strains. The epidemic strain caused a large number of SSTIs during a short period compared to the number of sporadic SSTIs caused by PVL-negative MSSA before and after the outbreak.

In conclusion, this investigation is probably the first reported outbreak of PVL-positive MSSA SSTIs in a French prison. Challenges in controlling the outbreak included the absence of routine screening for MSSA carriage and high risk of recurrent infection due to the characteristics of the population (low educational level, poor compliance with antibiotic treatments, and poor adherence to hygiene measures leading to re-contamination with their own strain or cross-transmission in collective areas). The experience acquired during the outbreak helped to inform the 2012 French national guidelines issued by the French National Authority for Health and Ministry of Justice. These guidelines and those issued in 2011 by the Health Protection Agency in the UK should help to control communicable diseases in correctional facilities. Inmates should be able to receive tattoos under safety conditions identical to those available to the general public. Further investigations are needed to evaluate the risk of S. aureus transmission by tattooing in inmates.

Competing Interests

The authors have declared that no competing interests exist.

Acknowledgments

We thank the prison management and employees for their contributions and permission to investigate and report the outbreak. We also thank Maryline Boidé for her contribution to the investigation and Aurélie Guillouzouic and Julie Marraillac for their technical assistance with molecular typing.

Funding Statement

None declared.

Contributor Information

Céline Bourigault, Bacteriology and Hygiene Department, Nantes University Hospital, 44000 Nantes, France.

Stéphane Corvec, Bacteriology and Hygiene Department, Nantes University Hospital, 44000 Nantes, France; University of Nantes, EA 3826, Medical School, 44000 Nantes, France.

Virginie Brulet, Jail Medical Center, 44000 Nantes, France.

Pierre-Yves Robert, Jail Medical Center, 44000 Nantes, France.

Olivier Mounoury, Jail Medical Center, 44000 Nantes, France.

Chloé Goubin, Jail Medical Center, 44000 Nantes, France.

David Boutoille, Infectious Diseases Department, Nantes University Hospital, 44000 Nantes, France.

Bruno Hubert, Regional Unit of Epidemiology and Diseases Control, Pays de la Loire Area, 44000 Nantes, France.

Michèle Bes, National Reference Center for Staphylococci, University of Lyon, 69000 Lyon, France.

Anne Tristan, National Reference Center for Staphylococci, University of Lyon, 69000 Lyon, France.

Jérôme Etienne, National Reference Center for Staphylococci, University of Lyon, 69000 Lyon, France.

Didier Lepelletier, Bacteriology and Hygiene Department, Nantes University Hospital, 44000 Nantes, France; University of Nantes, EA 3826, Medical School, 44000 Nantes, France.

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