https://www.selleckchem.com/pr....oducts/colivelin.htm
The median duration of exposure (interquartile range) was 30 (15-12 minutes. Only 5/400 (1.3%) developed infection, all in the first 2 weeks of the epidemic. After introduction of universal masking and despite loosening the isolation criteria, none of the exposed HCWs developed COVID-19. Relatively short exposures of HCWs, even if only either the worker or the patient wears a mask, probably pose a very low risk for infection. This allowed us to perform strict follow-up of exposed HCWs in these exposures, combined with repeated testi
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