> We investigated the presence of SARS-CoV-2 [...] antibodies in blood samples of 959 asymptomatic individuals enrolled in a prospective lung cancer screening trial between September 2019 and March 2020 [...]. SARS-CoV-2 RBD-specific antibodies were detected in 111 of 959 (11.6%) individuals, starting from September 2019 (14%), with a cluster of positive cases (>30%) in the second week of February 2020 and the highest number (53.2%) in Lombardy.
That sample size is large enough to make fairly confident statements about infections and immunity among the entire Italian population over that period of time.
@raucao infections much earlier than suspected!
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