Two or 3 vaccine doses may cut risk of long COVID

An observational study of Italian healthcare workers infected with SARS-CoV-2 who didn't require hospitalization suggests a link between two or three doses of vaccine and a lower prevalence of long COVID. In the modeling study, published late last week in JAMA, researchers in Milan studied 2,560 workers at nine healthcare facilities from March 2020 to April 2022. All healthcare workers were mandated to receive three doses of the Pfizer/BioNTech mRNA COVID-19 vaccine in 2021. And all were screened for COVID-19 once a week or every 2 weeks and when they developed symptoms or were exposed to the virus.