Vaccines
Patients Previously Infected with COVID-19 May Only Need Single Dose of Pfizer Vaccine
Research presented virtually at the Conference for Retroviruses and Opportunistic Infections suggests that individuals previously infected with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) may produce substantial levels of antibodies against COVID-19 after a single dose of the Pfizer mRNA vaccine, potentially exceeding those of individuals who have not been