Red Cross: 5.5% of CT blood donations tested positive for COVID FacebookTwitterEmail A map showing the prevalence of antibodies in Red Cross blood donations in the northeast.Submitted/Red Cross This originally appeared as part of our daily coronavirus newsletter. to get it delivered to your inbox. About 5.5 percent of all the Red Cross blood donations from healthy, unvaccinated Connecticut residents since June have tested positive for COVID antibodies, the organization said this week. Overall, the Red Cross tested 3 million blood donations, including 82,353 in Connecticut, between mid-June 2020 and mid-February. The national positivity rate was 6.6 percent over that time, higher than Connecticut’s average, suggesting the spread of the coronavirus was better contained in this state than in others. In fact, the Northeast had a lower positivity rate than other U.S. regions.