More than 40 worshipers who attended a service after the lockout was eased in Germany earlier this month contracted a coronavirus, officials said.
The service was held on May 10 in a Baptist church in Frankfurt.
Church officials say they followed social distancing rules and disinfected the building before service.
Each of the 16 German states determines its own lockout exit plans. Hesse, where Frankfurt was located, relaxed restrictions on worship on May 1.
Those attending services should be 1.5 m (5 feet) apart and provided with hand sanitizer.
Wladimir Pritzkau, deputy head of the Evangelical Christian Baptist congregation in Frankfurt, told German media that the rules were followed during the May 20 service.
Six of the infected were transported to hospital.
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At least 16 of those infected lived in Hanau, east of Frankfurt. As a result, the city canceled a prayer rally that Muslim leaders had organized for this Sunday.
Germany has recorded a relatively small number of Covid-19 cases and deaths – 177,850 and 8,216 respectively, according to the Robert Koch Institute, a federal health agency.
This has allowed the country to relax the restrictions in the past two weeks.
Stores are now reopened, students are returning to class, and the Bundesliga has become the first major European football league to resume after the pandemic.