Covid-19 Vaccination


Vaccination Sites in Chelsea 


Chelsea Senior Center

10 Riley Way (across from City Hall, behind the Fire Station).

Walk-ups only. 

  • Saturdays: 10:00 a.m. -5:00 p.m.  
    through June 30th. 


Pediatric COVID-19 Vaccine

  • The pediatric COVID-19 vaccine is available at the Chelsea Senior Center clinic.

Updated COVID-19 Booster 

People ages 6 months and older are recommended to receive 1 updated (bivalent mRNA) booster dose after completion of any primary series or previously received monovalent booster dose(s) with the following exception: children 6 months–4 years who receive a 3-dose Pfizer-BioNTech primary series are not authorized to receive a booster dose at this time regardless of which Pfizer-BioNTech vaccine (i.e., a monovalent or bivalent) was administered for the third primary series dose. Monovalent mRNA vaccines are not authorized as a booster dose.

For people ages 6 years and older, your booster vaccine does NOT need to be the same as your primary series – “mix & match” is OK.

For people under 6 years of age, the booster vaccine should be the same product as the primary series (if you got a Pfizer primary series, you should get the Pfizer booster; if you got the Moderna primary series, you should get the Moderna booster)

The recommendations can vary based on your age and which product you get. Check with your healthcare provider or vaccine administrator, or find more information at

About the vaccine: