PRO/AH/EDR> COVID-19 update (98): transmission, long COVID, vaccine reactions, WHO, global

COVID-19 -- Worldwide/Unknown
Abstract
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In 2019-2020, the COVID-19 pandemic spread to over 200 countries in less than 6 months. To understand the basis of this aggressive spread, it is essential to determine the transmission rate and define the factors that increase the risk of transmission. One complication is the large fraction of asymptomatic cases, particularly in young populations: these individuals have viral loads indistinguishable from symptomatic people and do transmit the SARS-CoV-2 virus, but they

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