A Cluster of Novel Coronavirus Disease 2019 Infections Indicating Person to Person Transmission Among Casual Contacts From Social Gatherings: An Outbreak Case Contact Investigation
Abstract Background Severe acute respiratory syndrome coronavirus 2, the pathogen causing novel coronavirus disease of 2019 (COVID 19) efficiently spreads from person to person in close contact settings. Transmission among casual contacts in settings such as during social gatherings is not well understood. Methods We report several transmission events to both close and casual contacts from a cluster of 7 COVID 19 cases occurring from mid January to early February 2020. A total of 539 social and family contacts of the index patient's, including members of a 2 day wedding and a family party, were contacted and screened through epidemiologic surveys. The clinical progression of all cases is described. Results We estimate the secondary attack rate among close contacts to be 29% (2 of 7) and for the casual contacts to be 0.6% (3 of 473) The incubation period of our case cluster was 4 12 days (median, 7 days) Conclusions Transmission efficiency among close contacts was higher than among casual contacts; however, transmission from second generation cases may help spread the virus during the incubation period.
Open forum infectious diseases