This page summarizes available information on COVID-19 vaccination in
CT. COVID-19 vaccination data tables can be found here including information on how the data are analyzed. Other data on COVID-19 in CT are posted here.
COVID-19 vaccination data are
updated weekly on Thursdays. Weekly reports include doses reported
to CT Wiz by 11:59 P.M. the Tuesday prior to publication. All COVID-19 vaccine
data are preliminary and are subject to change as additional records are
received and as duplicate records are removed and other errors are corrected.
Currently, the Pfizer vaccine
is approved for use in people 16 years and older and authorized for people 5 to
15. The Moderna vaccine is approved for people
18 and over. The Johnson & Johnson
vaccines is authorized for people 18
years and over. Generally, people are
considered to have completed a primary series if they have received 2 Pfizer or
Moderna vaccine doses or 1 Johnson & Johnson vaccine dose. However, people who are moderately or severely
immunocompromised are recommended to receive one additional dose in the primary
series. All people 12 and over are currently recommended to receive a booster dose
after completion of the primary series. At this time, some people may receive a
second booster (people 50 years and over, moderately or severely immunocompromised people, people who have received only J & J vaccine). CDC recommendations on COVID-19 vaccination can be seen here.
In the data shown here, a person who has received at least one dose of
COVID-19 vaccine is considered to have initiated vaccination. A person is
considered fully vaccinated if he/she has completed a primary vaccination
series by receiving 2 doses of the Pfizer or Moderna vaccines or 1 dose of
the Johnson & Johnson vaccine. The fully vaccinated are a subset of the
people who have received at least one dose.
A person who completed a
Pfizer, Moderna or Johnson & Johnson primary series (as defined above) and then had an
additional dose of COVID-19 vaccine is considered to have had additional dose 1. The additional dose may be Pfizer,
Moderna or Johnson & Johnson and may be a different type from the primary
series. For most people, additional dose 1 is a booster. However, additional
dose 1 may represent a supplement to the primary series for a people who is
moderately or severely immunosuppressed.
Unless otherwise specified, coverage percentages are based on 2019 CT population
estimates.
The total number of first doses of COVID-19 vaccine given since it became available in December 2020 is shown here by week.
The number and percentage of people who have had
at least one dose of COVID-19 vaccination, are fully vaccinated, and have had additional dose 1 by age group is shown below.
Vaccine coverage (at least one dose) by race/ethnicity and age group is shown below. Data on coverage by race/ethnicity should be interpreted with caution because of the challenges of classifying race/ethnicity and because people with a missing or other race cannot be included in the vaccine coverage percentages. Click here to see data on those who are fully vaccinated and who have received additional dose 1 and for a more in-depth description of the methods used to assess vaccine coverage by race/ethnicity and their limitations.
Vaccine coverage is also assessed based on where people live including by county, town and census tract. Town of residence is verified by geocoding the reported address and then mapping it to a town using municipal boundaries. If an address cannot be geocoded, the reported town is used, if available. A census tract cannot be determined for addresses that cannot be geocoded.
The map below shows the percentage of people who have had at least one dose of COVID-19 vaccine by town of residence. Town-level coverage estimates have been capped at 100%. Observed coverage may 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, change in population size since the census), errors in address data or duplicate or mismatched.
Additional
town-level data including percentage who are fully vaccinated or who have
received additional dose 1 can be found here (all ages) and
here (by age group).
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 their hometown, the student may be counted as a vaccine recipient in that town.
Coverage by census tract is shown in the map below. A census tract cannot be determined for
addresses that cannot be geocoded. Again,
coverage is capped at 100%. Census tract population is
based on the 2019 5-year American Community Survey.
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 DPH 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 with that of those who live in another zip code. Coverage estimates by SVI Priority Zip Codes are based on 2018 census data provided by ESRI.
Data Quality and Status
Connecticut
COVID-19 Vaccine Program providers are required to report information on all
COVID-19 vaccine doses administered to CT WiZ, the Connecticut Immunization
Information System. This includes doses given to residents of CT and to
residents of other states vaccinated in CT. Data on doses administered to CT
residents out-of-state are being added to CT WiZ jurisdiction-by-jurisdiction.
Doses administered by some Federal entities (including Department of Defense,
Department of Correction, Department of Veteran’s Affairs, Indian Health
Service) are not yet reported to CT WiZ. Data
reported here reflect the vaccination records currently reported to CT WiZ. However, once
CT residents who have received doses in each jurisdiction are added to CT WiZ,
the records for residents of that jurisdiction vaccinated in CT are removed.
For example, when CT residents vaccinated in NYC were added, NYC residents
vaccinated in CT were removed.
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 for a number 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.