Research based on VA records indicates incidence of PASC or long COVID a year later.
https://www.nejm.org/doi/full/10.1056/NEJMoa2403211
PASC or long COVID a year after infection, per 100 persons:
| Time frame | Unvaccinated | Vaccinated |
|---|---|---|
| Pre-Delta era | 10.42 | |
| Delta era | 9.51 | 5.34 |
| Omicron era | 7.76 | 3.50 |