Summary
Background/Purpose
Investigation of a COVID-19 super-spreading event involving both beta and delta variants of SARS-CoV-2, following a choir in a mental health centre.
Methods
An epidemiological and biological (RT-PCR, mutations screening and sequencing) investigation was carried out to identify the chains of transmission. A morbidity and mortality review was performed using ALARM root causes analysis to understand how this superspreading event could have taken place.
Results
On May 25 and 26, 2021, all 13 choir participants were screened. Of these, eight were positive. None of them was vaccinated. Biological results suggested seven cases of delta variants (three confirmed by sequencing) and one case of beta variant. The screening of 141 contact individuals identified 21 subsequent cases with a suspected delta variant and two cases of suspected beta variant. Since the two index cases had similar Ct during the choir, this suggests different spreading abilities. The contributing factors were multiple, including underestimation of infectious risks by the social therapy team in relation to low individual and collective perceived vulnerability
Conclusion
HCPs involved in sociotherapy must be aware of, and trained to mitigate, the risk of superspreading event. Conventional distancing and good natural ventilation appear to not be enough to prevent spread of more transmissible variants of SARS-CoV-2.
【저자키워드】 COVID-19, SARS-CoV-2, infection control, mental health services, Cross-infections, Root cause analysis, 【초록키워드】 Mutation, mental health, Sequencing, variant, Ventilation, risk, Transmission, delta variant, RT-PCR, Spread, epidemiological, morbidity and mortality, Beta variant, investigation, Analysis, Contact, index case, Biological, Factor, Social Therapy, individual, participant, positive, infectious risk, mitigate, Prevent, hcp, Seven, Result, identify, carried, involved, subsequent, eight, was performed, screened, suggested, cause, Conventional, transmissible variant, 【제목키워드】 mental health, variant, activity, French,