We evaluated SARS-CoV-2 RNA and neutralising antibodies in blood donors (BD) residing in the Lodi Red Zone, Italy. Of 390 BDs recruited after 20 February 2020 - when the first COVID-19 case in Lombardy was identified, 91 (23%) aged 19-70 years were antibody positive. Viral RNA was detected in an additional 17 (4.3%) BDs, yielding ca 28% (108/390) with evidence of virus exposure. Five stored samples collected as early as 12 February were seropositive.
Cassaniti I.;Maserati R.;Di Martino R.;Mojoli F.;Bruno R.
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