PMC:6988272 / 10577-11361 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/6988272","sourcedb":"PMC","sourceid":"6988272","source_url":"https://www.ncbi.nlm.nih.gov/pmc/6988272","text":"To date, as at 22 January, official information has not been sufficient to determine the source of infection and risk of human-to-human transmission for the newly emerged 2019-nCoV. Two competing hypotheses are therefore proposed and compared as potential explanations for the characteristics of the current outbreak of 2019-nCoV infections within and outside mainland China. Scenario 1 comprises a large zoonotic spillover event starting in early December 2019, perhaps over a number of days or weeks, and very limited human-to-human transmission subsequently. Scenario 2 comprises a small zoonotic spillover event in early December 2019 followed by efficient human-to-human transmission. Evidence consistent or inconsistent with each of these two scenarios is outlined in the 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