Connecticut COVID-19 Update

As of July 7, 2021, updates to COVID-related death counts will occur only on Thursdays.
Click here for an archive of PDF reports on COVID-19 from the CT Department of Public Health, including detailed reports released every Thursday.
The Past 7 Days column indicates all PCR/NAAT tests by specimen collection date from the past 7 days. Test positivity is calculated as a rolling 7-day test positivity by specimen collection date; all positive molecular (PCR/NAAT) test results are divided by all molecular (PCR/NAAT) test results (positive and negative) for the last 7 days and multiplied by 100 to reach a percentage. Hospitalizations over the past 7 days indicates the change in the number of patients hospitalized with COVID-19 over that period. Deaths over the past 7 days indicates the number of new COVID-19 associated deaths reported; deaths are reported once weekly. 
As of April 4th 2022, negative rapid antigen and rapid PCR test results for SARS-CoV-2 are no longer required to be reported to the Connecticut Department of Public Health. Negative test results from laboratory based molecular (PCR/NAAT) results are still required to be reported as are all positive test results from both molecular (PCR/NAAT) and antigen tests. Both positive molecular (PCR/NAAT) and antigen tests will continue to be used for determining case status. 
National COVID-19 statistics and information about preventing spread of COVID-19 are available from the Centers for Disease Control and Prevention.
Day-to-day changes reflect newly reported cases, deaths, and tests that occurred over the last several days to week. All data in this report are preliminary; data for previous dates will be updated as new reports are received and data errors are corrected. Hospitalization data were collected by the Connecticut Hospital Association. Deaths reported to either the Office of the Chief Medical Examiner or DPH are included in the daily COVID-19 update.

COVID-19 Cases, Hospitalizations, Deaths and Tests Over Time

In Connecticut during the early months of this pandemic, it became increasingly clear that it would be necessary to track probable COVID-19 cases and deaths, in addition to laboratory-confirmed (e.g. RT-PCR) cases and deaths. This was needed to better measure the burden and impact of this disease in our communities and is now part of the national surveillance case definition for COVID-19. Prior to June 1, probable and confirmed cases were reported together.
COVID-19 Cases over Time
This chart shows the number of COVID-19 cases reported to CT DPH by day of first positive specimen collection or onset of illness.
More information about hospitalized cases of COVID-19 in New Haven and Middlesex Counties is available from COVID-NET.
COVID-19 Associated Deaths
This chart shows the number of COVID-19-associated deaths among Connecticut residents by date of death. COVID-19-associated deaths involve persons who tested positive for COVID-19 around the time of death (confirmed), and those who were not tested for COVID-19 whose death certificates list COVID-19 disease or SARS-CoV-2 infection as a cause of death or a significant condition contributing to death (probable).
Number of COVID-19 Tests by Date of Specimen Collection
Testing for COVID-19 has increased over the course of the pandemic. Both the availability of supplies needed to perform the tests and the number of laboratories performing tests have increased.
There are different kinds of tests for COVID-19. This graph shows the number of molecular and antigen tests reported to CT DPH by the date the specimen was collected. Fewer people are tested on Saturdays and Sundays compared to Monday through Friday.

Cumulative COVID-19 Cases and Deaths by County, Town, Age, Gender, and Race/Ethnicity

The following graphs show COVID-19 data by the Connecticut counties.  

COVID-19 by Age Groups

As with many other illnesses, age plays an important role in COVID-19. The graph below shows the number of COVID-19 cases and associated deaths by age groups. Because rates put disease frequency in the perspective of the size of the population, rates are particularly useful to compare disease frequency in different locations, at different times, or among different groups of people with different sized populations.

Both Case counts and rates among older age groups have declined since early in 2021 as individuals in those age groups become vaccinated, thus skewing the distribution of infections towards younger age groups over time. The number of COVID-19 cases is currently highest among adults age 20-39 compared to other age groups, as is the rate of cases per 100,000 population.

COVID-19 by Race and Ethnicity

The following graphs show the number and rate of cases and deaths by race and ethnicity. Categories are mutually exclusive. The category “multiracial” includes people who answered ‘yes’ to more than one race category. Approximately 30% of COVID-19 reports are missing information on the patient's race and ethnicity.
Additionally, the graphs show the rate of COVID-19 cases and COVID-19-associated deaths per 100,000 population by race and ethnicity. Crude rates represent the total cases or deaths per 100,000 people. Age-adjusted rates consider the age of the person at diagnosis or death when estimating the rate and use a standardized population to provide a fair comparison between population groups with different age distributions. Age-adjustment is important in Connecticut because the median age of among the non-Hispanic white population is 47 years, whereas it is 34 years among non-Hispanic blacks, and 29 years among Hispanics. Because most non-Hispanic white residents who died were over 75 years of age, the age-adjusted rates are lower than the unadjusted rates. In contrast, Hispanic residents who died tend to be younger than 75 years of age which results in higher age-adjusted rates. 
The 2018 Connecticut DPH Population Statistics and 2000 US Standard Million populations were used for age adjustment. Categories are mutually exclusive. Cases missing data on race/ethnicity are excluded from calculation of rates. NH=Non-Hispanic 
Community COVID-19 Cases and Tests in the Past 2 Weeks
This map shows the average daily rate of new COVID-19 cases per 100,000 population by town during the past two weeks. This map is updated weekly on Thursdays. Hover over a town to see the number of new cases, case rate, which is the average daily number of new cases per 100,000 population during the past two weeks, and the date range for the two week report period.
This map only includes cases among persons living in community-settings and excludes cases among persons residing in nursing homes, assisted living, and correctional facilities. Cases pending address validation are excluded from the map. 
COVID-19 Cases, Deaths, and Tests by Town
This map shows the distribution of COVID-19 cases, deaths, and tests since the beginning of the pandemic. Darker colors indicate towns with more cases.

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 cases and/or laboratory reports.  CT DPH and your Local Health Department or District staff are all working to ensure only the best data and information are available for state and local decision makers.

Where Can I Get the Data?

CT DPH in partnership with the CT Office of Policy and Management (CT OPM) publishes data on the state's open data portal.  You can find the data, charts, graphs, and maps here.