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Transmission of respiratory pathogens from asymptomatic persons to recipients no doubt occurs in many types of infection. For example, chickenpox is highly contagious several days before the classic rash erupts and is likely spread by varicella virus from the respiratory tract (although this has rarely been documented). As part of the current multifaceted exploration of the pathogenesis of the novel coronavirus SARS-CoV-2, researchers attempted to document whether this virus could be spread in the asymptomatic phase of infection. The subset of asymptomatic transmitters of infection they chose were patients who ultimately became symptomatic. Therefore, transmission from these patients was dubbed presymptomatic.
Investigation of all 243 cases …