 The study found that close contacts of adults at high risk of infection due to occupation, such as spouses, relatives, and those living in households with more than three people, are more likely to be infected with SARS-CoV-2. Additionally, close contacts of symptomatic primary cases have an increased risk of being secondary cases compared with non-relatives and close contacts of an asymptomatic index case. This article was authored by Andrea Ramirez-Varela, Sandra Contreras-Arieta, Guillermo Tamayo-Cabeza, and others.