Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Relative risk of infection with the Delta variant from May to August 2021.
| Month | Central Massachusetts except Worcester, RRa (95% CI) | Worcester, RR (95% CI) |
| May | Refb | 3.14 (2.63-3.64) |
| June | 5.76 (5.13-6.38) | 12.75 (11.99-13.51) |
| July | 20.29 (19.86-20.72) | 22.56 (21.77-23.35) |
| August | 22.33 (21.90-22.77) | 22.34 (21.82-22.87) |
aRR: relative risk.
bRef: reference group.
