Human fall flat igg4/10/2023 ![]() Transmission modelling studies of SARS-CoV-2 assume that infection produces immunity to reinfection for durations of at least one year 2, 3. Populations immuno-naive to SARS-CoV-2 are considered to have markedly contributed to the dramatic increase in cases worldwide. In China, the number of laboratory-confirmed cases has exceeded 80,000, resulting in >4000 deaths 1. Since its emergence in December 2019, the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) that causes coronavirus disease 2019 (COVID-19) has caused a pandemic affecting 216 countries, areas, or territories with > 13 million cases and at least 574,464 deaths as of J1.
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