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abstractpubmed· Abstract 2020· item PMID:32603652

Large SARS-CoV-2 Outbreak Caused by Asymptomatic Traveler, China. An asymptomatic person infected with severe acute respiratory syndrome coronavirus 2 returned to Heilongjiang Province, China, after international travel. The traveler's neighbor became infected and generated a cluster of >71 cases, including cases in 2 hospitals. Genome sequences of the virus were distinct from viral genomes previously circulating in China.