Massachusetts COVID clusters by type of exposure

Coronavirus Local Impact

(WWLP) – The weekly Massachusetts Department of Health report identifies cases of clusters. The following information is posted every Thursday by 5 p.m. The current data below was posted Friday, November 27 due to the Thanksgiving holiday.

New Clusters (identified 10/25 – 11/21)

  • Household: 7,850
  • Long Term Care Facilities: 116
  • Child Care: 74
  • 24/7 Congregate Settings: 32
  • K-12 Schools: 30
  • Restaurants & Food Courts: 29
  • Industrial Settings: 28
  • Colleges & Universities: 27
  • Senior Living: 27
  • Social Gatherings: 23
  • Other Healthcare: 12
  • Hospitals: 12
  • Other Workplaces: 11
  • Organized Athletics/Camps: 10
  • Offices: 8
  • Places of Worship: 6
  • Corrections: 6
  • Retail & Services: 5
  • Other: 5
  • Other Food Establishments: 4
  • Shelters: 4
  • Recreation/Cultural: 1
  • Travel & Lodging: 1

Total Clusters by Setting

  • Household: 10,562
  • Long Term Care Facilities: 229
  • Child Care: 137
  • Restaurants & Food Courts: 77
  • Industrial Settings: 70
  • 24/7 Congregate Settings: 66
  • Social Gatherings: 62
  • K-12 Schools: 63
  • Senior Living: 48
  • Organized Athletics/Camps: 42
  • Colleges & Universities: 42
  • Hospitals: 29
  • Retail & Services: 26
  • Other Healthcare: 26
  • Other Workplaces: 22
  • Offices: 17
  • Places of Worship: 16
  • Corrections: 16
  • Other: 12
  • Other Food Establishments: 8
  • Recreation/Cultural: 8
  • Shelters: 6
  • Travel & Lodging: 3

Clusters Within Long-Term Care Facilities

  • A confirmed case is defined as a staff or resident with a new positive COVID-19 test result.
  • Confirmed cases are reported by each facility in aggregate, at least once a week, and are assigned to the week in which the data are submitted.
  • A “new” cluster is defined as two or more confirmed cases in a facility that has not reported a confirmed case in the prior 4 weeks.
  • A cluster is deemed closed when a facility has gone two incubation periods (28 days) without reporting a confirmed case among staff or residents.

Household Clusters

  • A household “cluster” is defined as two or more confirmed Massachusetts cases, who reside at the same address with COVID-19 infection within 28 days of each other, and who are not associated with another cluster.
  • The date assigned to each confirmed case’s event is that of the first positive lab date.
  • A cluster is deemed closed once two incubation periods (28 days) have passed from the last confirmed case.

All Other Clusters

  • All other “clusters” are defined as two or more confirmed Massachusetts cases with a common exposure.
  • The date assigned to each confirmed case’s event is that of the first positive lab date.
  • The date assigned to each contact is that of the date they were linked to the cluster.
  • A cluster is deemed closed once two incubation periods (28 days) have passed from the last confirmed case.

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