presymptomatictransmission likely occurred. Among the 243 cases of COVID-19 reported in … This study identified seven clusters of cases in which presymptomatictransmission of COVID-19 likely occurred; 10 (6.4%) of such cases included in these clusters were among the 157 locally acquired cases reported in Singapore as of March16. Containment measures should account for the possibility of presymptomatictransmission by including the …
Investigation of all 243 cases of COVID-19 reported in Singapore during January 23–March 16 identified seven clusters of cases in which presymptomatic transmission is the most likely explanation for the occurrence of secondary cases.