Up to 25 cases of Covid-19 have been confirmed within the military at Catterick Garrison.
Military bosses say a “small number” of personell have tested positive and are now isolating.
An Army Spokesperson said: “We can confirm that a number of service personnel at Catterick Garrison are currently self-isolating following a small number of personnel testing positive for Covid-19.
“The health and wellbeing of our personnel remains a priority and, in line with government guidance, we are taking appropriate measures to support individuals affected.”
North Yorkshire County Council say they have received details on the positive cases in Catterick Garrison from the Army.
Dr Lincoln Sargeant, director of public health for North Yorkshire, said: “We had about 25 cases associated with the military in the Catterick Garrison area.
“The military has their own process, so that’s information that has been passed on to us.”
In total, 76 cases have been recorded in the district in the last ten days, although there have been no positive tests within the last two days.
The district’s seven-date rate was over 100 confirmed cases per 100,000 people, however it has now dropped to 91.
Data from September 27 to October 3 shows there were 31 positive tests in Catterick Garrison and Colburn, as well as nine in Richmond, eight in Catterick Village and Brompton-on-Swale, eight in north Richmondshire, eight in Leyburn, Middleham and Tunstall, and three in the Upper Dales.