Breakthrough Infections of SARS-CoV-2 Gamma Variant in Fully Vaccinated Gold Miners, French Guiana, 2021

An outbreak of severe acute respiratory syndrome coronavirus 2 caused by the Gamma variant of concern infected 24/44 (55%) employees of a gold mine in French Guiana (87% symptomatic, no severe forms). The attack rate was 60% (15/25) among fully vaccinated miners and 75% (3/4) among unvaccinated miners without a history of infection.

Automated summary

An outbreak of severe acute respiratory syndrome coronavirus 2 caused by the Gamma variant infected 55% of employees at a gold mine in French Guiana, with 87% showing symptoms but no severe cases. Among fully vaccinated miners, the attack rate was 60%, while it was 75% among unvaccinated miners without a history of infection.