No one should assume this to be a one-and-done vaccine volley against this virus. Booster shots are already being developed, and it is too soon to let down our guard in public. Even as the number of fully vaccinated individuals in the United States passes 56 million, we are seeing a fresh surge in cases.
- There is evidence that reinfection remains a rare event. Results from cohort studies confirm that the protective effect of previous SARS-CoV-2 infection ranges from 81% to 100% from Day 14 following initial infection, for a follow-up period of five to seven months. Protection against reinfection is lower in individuals aged 65 years and older.