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COVID-19 outbreak among French firefighters, Marseille, France, 2020

Abstract : We investigated a COVID-19 outbreak at a fire station in Marseille, France. Confirmed cases were defined as individuals with positive SARS-CoV-2 reverse transcription (RT)-PCR and/or neutralising antibodies. All 85 firefighters at work during the outbreak period were included after questioning and sampled for RT-PCR and viral neutralisation assay. Twenty-three firefighters were confirmed positive, 19 of them were symptomatic, and four asymptomatic cases were confirmed by virus neutralisation. A total of 22 firefighters had specific neutralising antibodies against SARS-CoV-2. Neutralising antibodies were found in four asymptomatic and 18 symptomatic cases. Eleven symptomatic cases had high titres (≥ 1:80). The earliest detection of neutralising antibodies was 7 days after symptom onset, and 80% had neutralising antibodies 15 days after onset. One viral culture was positive 13 days after onset. The attack rate was 27%. We identified two introductions of the virus in this outbreak, through a presymptomatic and a paucisymptomatic case. Asymptomatic cases were not the source of a third generation of cases, although they worked without wearing a mask, indicating that asymptomatic cases did not play a significant role in this outbreak. Management and strategy based on early research of clinical signs associated with self-quarantine was effective.
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Submitted on : Monday, April 25, 2022 - 2:48:14 PM
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Guillaume Durand, Franck de Laval, Albane de Bonet d'Oléon, François Le Flem, yann Morin, et al.. COVID-19 outbreak among French firefighters, Marseille, France, 2020. Eurosurveillance, European Centre for Disease Prevention and Control, 2021, 26 (41), pp.2001676. ⟨10.2807/1560-7917⟩. ⟨inserm-03651099⟩



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