Using Open-Source Intelligence to Detect Early Signals of COVID-19 in China: Descriptive Study
BackgroundThe coronavirus disease (COVID-19) outbreak in China was first reported to the World Health Organization (WHO) on December 31, 2019, and the first cases were officially identified around December 8, 2019.Although the origin of COVID-19 has not been confirmed, approximately half of the early cases were linked to a seafood market in Wuhan.H