Coronavirus

Just 1 Mass. community has the highest risk of COVID-19 transmission this week

The community in the red zone isn't one of the ones with the highest risk from last week.

Jonathan Wiggs/Globe staff, file

Just one community has the highest risk of COVID-19 transmission this week, and it isn’t one of the two on the list from last week.

Tisbury is the only community in the red zone, with a positivity rate of 6.86 percent. Lawrence and New Bedford were the two communities with the highest risk last week. Both cities fell to a yellow designation this week.

For those who may not know where Tisbury is, it’s located on Martha’s Vineyard and has just over 4,000 residents, according to U.S. Census data.

Most of Massachusetts – 233 communities – has a grey designation, meaning the city or town had less than 15 or 10 new cases (depending on its size) in the last two-week period. Meanwhile, 19 communities are designated “yellow” and 98 are “green.”

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A community receives a red-zone designation based on a few factors. Small communities with under 10,000 residents are placed in the red zone if they have more than 25 cases total over the last two weeks. For communities between 10,000 and 50,000 people, a red-zone designation is given if the community has 10 or more average daily cases per 100,000 residents and if the positivity rate is greater than or equal to 5 percent. For communities over 50,000, they need a daily average of 10 or more cases per 100,000 residents and a positivity rate of 4 percent or higher.

Towns given a yellow designation meet one of the two benchmarks noted above for red-zone communities, but not both. Green towns fall below both of those thresholds.

Map of risk for COVID-19 transmission in each Massachusetts community. – Massachusetts Department of Public Health
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