The odds of long COVID-19 fall by more than half after two doses of vaccine, the risk of hospitalization drops by more than two-thirds, and breakthrough infections are nearly twice as likely to be asymptomatic, according to a UK study yesterday in The Lancet Infectious Diseases.The prospective case-control study, led by King's College London researchers, analyzed data from 1,240,009 UK adults 18 years and older using a cell phone app to report infection status.
Users had received a first dose of COVID-19 vaccine 14 or more days after the first dose or 7 or more days after their second dose, from Dec 8, 2020, to Jul 4, 2021.The users were matched 1:1 with two control groups, one reporting a negative test within 14 days of their first dose