Home NYT Uncertain Results in Study of Convalescent Serum for Covid-19 Uncertain Results in Study of Convalescent Serum for Covid-19 personhttp://healtyertips.blogspot.com/ May 22, 2020 0 share By BY GINA KOLATA from NYT Health https://ift.tt/2M4HVzv Tags NewyorkNYT Facebook Twitter Whatsapp Newer Older