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Time and intimacy drive transmission A minority of people infected with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) transmit most infections. How does this happen? Sun et al. reconstructed transmission in Hunan, China, up to April 2020. Such detailed data can be used to separate out the relative contribution of transmission control measures aimed at isolating individuals relative to population-level distancing measures. The authors found that most of the secondary transmissions could be traced back to a minority of infected individuals, and well over half of transmission occurred in the presymptomatic phase. Furthermore, the duration of exposure to an infected person combined with closeness and number of household contacts constituted the greatest risks for transmission, particularly when lockdown conditions prevailed. These findings could help in the design of infection control policies that have the potential to minimize both virus transmission and economic stra

Sanofi pasteurChangjiang pharmaceutical companyUniversity of oxfordNational institutes of healthNational science fund for distinguished young scholarsNational scienceInstitutional review board of hunan provincial centerHunan provincial innovative construction special fundMetabiota incShanghai roche pharmaceutical companyHunan provincial centerFogarty international centerTechnology committeeTechnology major project of chinaDisease controlCreative commons attribution