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Connecticut Department of Public Health Issues Health Alert


CONTACT:     Chris Boyle, Director of Communications

(860) 706-9654 –


Connecticut Department of Public Health Issues Health Alert:

Tolland County Now Upgraded To The “High Transmission” Category

Windham Is Now The Only County Listed In The “Substantial Transmission” Category


HARTFORD, Conn. – The Centers for Disease Control has now placed Tolland County in the “High Transmission” category of COVID-19. Tolland is the seventh county in the state to be upgraded to the High Transmission category. Fairfield, Hartford, Litchfield, New Haven, New London, and Middlesex Counties also are listed as High Transmission. 


Windham is the only county in the state still classified by the CDC as being in the “Substantial Transmission” category. Late last week, Litchfield and Middlesex counties were upgraded to High Transmission. 


The High Transmission category—which is the most severe as defined by the CDC—is 100 or more cases per 100,000 people or a positivity rate of 10 percent or higher over the past seven days.


The Substantial Transmission category is 50 to 100 cases per 100,000 or a positivity rate between 8 and 10 percent over the past seven days.


With the ongoing rapid increase in cases of COVID-19 in the state due to the spread of the Delta variant, the Connecticut Department of Public Health strongly recommends that ALL CONNECTICUT residents over age two years, whether vaccinated or unvaccinated, return to wearing masks when in indoor public spaces. 


Vaccinated and unvaccinated individuals at high risk for complications from COVID-19, including those with compromised immune systems, diabetes, asthma, other lung diseases, pregnancy, or obesity, should also avoid large indoor gatherings that may include a mix of vaccinated and unvaccinated individuals.


Vaccination remains the most important defense against illness and hospitalization from COVID-19. So-called “vaccine breakthrough” cases have occurred in Connecticut, but they remain rare, and the vast majority of hospitalizations and deaths in Connecticut and around the country are in unvaccinated individuals. DPH strongly recommends that unvaccinated individuals get vaccinated as soon as possible to help stop the ongoing spread of the Delta variant. 


Published by: Heather Trabal, MD