This review aimed to describe what has been published on COVID-19 outbreaks originating from indoor places of worship.
Methods:
A systematic review was conducted following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) checklist by searching PubMed, Scopus and Embase from 1 January 2020 to 29 March 2021. Citation chasing was also performed. Studies with information about COVID-19 outbreaks originating in indoor places of worship of any religion were included.
Results:
A total of 9729 records were identified and 36 were selected. The articles reported 119 descriptions of outbreaks linked to churches, mosques, synagogues, and temples, referring to approximately 52–74 unique outbreaks. The outbreaks were mostly located in three major areas: East and Southeast Asia (46%), the USA (27%), Europe (22%). All the outbreaks began in 2020. Mainly, there were no restrictive measures, or such measures were not followed at the time of the outbreak. Choir practices presented the highest attack rate (up to 0.867).
Conclusions:
The lack of preventive measures and the role of singing practices were highlighted. Reports were often lacking contact tracing and sometimes did not report the date of outbreak extinction. Moreover, reports came from few geographical areas. Thus, the impact of transmission in places of worship may be largely underestimated.
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