By MyFM's Rick Michaels - The four largest cities in Massachusetts now officially fall in the high-risk category for COVID-19 spread based on the latest Department of Public Health weekly metric released yesterday. Boston, Worcester, Springfield and Lowell are among 23 communities that are now coded red, the designation assigned to municipalities where the average daily incidence rate is more than 8 cases per 100,000 residents. While Worcester was in the red last week, Boston, Lowell and Springfield were among the ten-communities moving into the highest risk category. In the MyFM Listening area no communities moved into the “RED”, but Wrentham was one of the three towns dropping into the “YELLOW” category. A total of 847 confirmed COVID-19 cases in Massachusetts are "associated with higher education testing," the department said in its report, including 218 which are new from last week. The 23 communities coded red are: Attleboro, Avon, Boston, Chelsea, Dracut, Everett, Framingham, Haverhill, Holliston, Lawrence, Lowell, Lynn, Lynnfield, Marlborough, Methuen, Middleton, Nantucket, New Bedford, North Andover, Revere, Springfield, Winthrop and Worcester. The color system took on new heft this week after Governor Charlie Baker on Tuesday announced communities that had not been designated “RED” in any of the past three weeks reports would be able to ease some restrictions. The department on Wednesday reported 510 new test-confirmed COVID-19 cases and 32 new deaths. The seven-day weighted average positive test rate remained at 1 percent, and the number of COVID-19 hospitalizations dropped by 6, to 438.