Abstract
Studies of household members and close contacts of individuals infected with a communicable disease such as COVID-19 are a key source of information for infectious disease epidemiologists. Exposure to an infectious individual is the most important risk factor for communicable diseases. In household studies, only individuals who have been exposed are included, allowing for careful examination of other individual-level risk factors and quantification of transmission probabilities. The study by Qin-Long Jing and colleagues1 published in The Lancet Infectious Diseases provides important insights into factors affecting transmission from COVID-19 primary cases and susceptibility of their close contacts.
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