For the most current information on Connecticut's COVID-19 response and rollout plan, please visit COVID-19 Vaccine in CT. The Connecticut Department of Public Health (CT DPH) is working to release additional COVID-19 vaccine-related data as soon as possible.
  • All COVID-19 vaccine data are preliminary and are subject to change as additional records are received and as duplicate records or other errors are corrected 
  • COVID-19 vaccination data will be updated weekly on Thursdays
  • The data are current as of 11:59 P.M.  the Monday prior to being published
Detailed vaccination data can be found here.   Other data on COVID-19 in CT are posted here.
COVID-19 vaccines currently authorized for use in the US require different numbers of doses.  A person who has received one dose of any vaccine is considered to have received at least one dose. A person is considered fully vaccinated if they have received 2 doses of the Pfizer or Moderna vaccines or 1 dose of the Johnson & Johnson vaccine. The fully vaccinated are a subset of the number who have received at least one dose. The number with At Least One Dose and the number Fully Vaccinated add up to more than the total number of doses because people who received the Johnson & Johnson vaccine fit into both categories.  The number of doses administered reported here may differ from information in the Monday Governor’s report because the data are accessed on a different day and are subject to additional deduplication and cleaning.
It can take up to 2 weeks after the last required dose for vaccination to achieve its full immunizing potential.   The Pfizer vaccine is authorized for use in people 16 years and older while the Moderna and Johnson & Johnson vaccines are authorized for those 18 and over. 
Number and Percent of People who have at least one dose of COVID-19 Vaccination and who are Fully Vaccinated by Race/Ethnicity and Age Group
The data on percent of people who have at least one dose of COVID-19 vaccination and are fully vaccinated by race / ethnicity should be interpreted with caution. It likely underestimates the percentages for different race / ethnicity groups (NH Asian and Pacific Islander, NH American Indian or Alaska Native, NH Black, NH White and Hispanic). This is because the Other race, Multiple race and Unknown groups are bigger than expected and likely include people who should be classified as NH Asian and Pacific Islander, NH American Indian or Alaska Native, NH Black, NH White and Hispanic.
First Dose of COVID-19 Vaccine by Age Group and Residence in a SVI Priority Zip Code
The Centers for Disease Control and Prevention has developed a Social Vulnerability Index (SVI) to help officials identify communities that may need support during an event like a pandemic. The CDC SVI ranks census tracts on 15 social factors, including poverty, lack of vehicle access, minority status and crowded housing. The higher the SVI score the greater the vulnerability of a community. CT has applied the SVI method to zip codes and designated zip codes in the top 20% as SVI Priority Zip Codes.  Vaccine coverage is compared for people who live in a priority zip code and for those who live in another zip code.    
CT DPH also monitors the percentage of COVID-19 vaccinated people (at least one dose) who live in a SVI priority zip code. The figure shows the percentage both cumulatively and weekly (weekly is based on doses administered between Sunday and Saturday of the week prior to release).   The percentages are by provider type: federally qualified health centers (FQHCs),  hospitals, pharmacies and local public health departments.  The percent labeled as total includes these provider types and all others.   


Vaccine Administration by Town

The following map is based on vaccine administration records received by CT WIZ . All data in this report are preliminary and are subject to change as additional records are received and as duplicate records or other errors are corrected.   
Total town-level population is based on the 2019 CT annual estimates for the all ages map.   
CT DPH has capped the percent of population coverage metrics at 100%. These metrics could be greater than 100% for multiple reasons, including census denominator data not including all individuals that currently reside in the town (e.g., part time residents) or potential data reporting errors.
Town of residence established by geocoding the reported address and then mapping it to town using municipal boundaries.  If an address could not be geocoded the post-office designated town was used, if available.
Additional town level data by age group can be found here Town-level population by age is based on the 2014 CT annual estimates for the age group maps.
Caution should be used when interpreting coverage estimates for towns with large college/university populations since coverage may be underestimated. In the census, college/university students who live on or just off campus would be counted in the college/university town. However, if a student was vaccinated while studying remotely in his/her hometown, the student may be counted as a vaccine recipient in that town.

Data Quality and Status

CT DPH and its partners go to great lengths to provide high quality data that is free of errors. Because of the nature of public health surveillance, there are times when data updates are necessary due to a variety of reasons. These include, but are not limited to, errors contained in the data CT DPH receives, updates to existing data as additional or new information becomes available, and the on-going de-duplication of vaccination data. CT DPH and it's local, state, and federal partners are all working to ensure only the best data and information are available for state and local decision makers.
Records for which a town could not be established were not be included in town-specific vaccine coverage estimates. Towns are identified and validated based on a combination of zipcode and self-reported address information.

CT DPH Immunization Program

More information on the CT DPH Immunization Program, including the Connecticut Immunization Information System (CT WIZ), can be found here.