Rates of COVID-19 Among Residents and Staff Members in Nursing Homes — United States, May 25–November 22, 2020

During the beginning of the coronavirus disease 2019 (COVID-19) pandemic, nursing homes were identified as congregate settings at high risk for outbreaks of COVID-19 (1,2). Their residents also are at higher risk than the general population for morbidity and mortality associated with infection with SARS-CoV-2, the virus that causes COVID-19, in light of the association of severe outcomes with older age and certain underlying medical conditions (1,3). CDC’s National Healthcare Safety Network (NHSN) launched nationwide, facility-level COVID-19 nursing home surveillance on April 26, 2020. A federal mandate issued by the Centers for Medicare & Medicaid Services (CMS), required nursing homes to commence enrollment and routine reporting of COVID-19 cases among residents and staff members by May 25, 2020. This report uses the NHSN nursing home COVID-19 data reported during May 25–November 22, 2020, to describe COVID-19 rates among nursing home residents and staff members and compares these with rates in surrounding communities by corresponding U.S. Department of Health and Human Services (HHS) region.* COVID-19 cases among nursing home residents increased during June and July 2020, reaching 11.5 cases per 1,000 resident-weeks (calculated as the total number of occupied beds on the day that weekly data were reported) (week of July 26). By mid-September, rates had declined to 6.3 per 1,000 resident-weeks (week of September 13) before increasing again, reaching 23.2 cases per 1,000 resident-weeks by late November (week of November 22). COVID-19 cases among nursing home staff members also increased during June and July (week of July 26 = 10.9 cases per 1,000 resident-weeks) before declining during August–September (week of September 13 = 6.3 per 1,000 resident-weeks); rates increased by late November (week of November 22 = 21.3 cases per 1,000 resident-weeks). Rates of COVID-19 in the surrounding communities followed similar trends. Increases in community rates might be associated with increases in nursing home COVID-19 incidence, and nursing home mitigation strategies need to include a comprehensive plan to monitor local SARS-CoV-2 transmission and minimize high-risk exposures within facilities.

On May 25, 2020, CMS-certified nursing homes began reporting data to NHSN in response to a federal mandate (4). This reporting included data on the number of beds occupied and the number of COVID-19 cases among residents and staff members confirmed by antigen tests or laboratory-based viral nucleic acid test results (5). Nursing home staff members and facility personnel comprise all persons working or volunteering in the facility, including contractors, temporary staff members, resident caregivers, and staff members who might work at multiple facilities (5). Data on COVID-19 cases among residents and staff members reported during May 25–November 22, 2020 were analyzed for nursing homes in all U.S. states, the District of Columbia, Guam, and Puerto Rico. Facilities are expected to enter incident COVID-19 case counts on residents and staff members weekly. Facilities were excluded from the analysis for specific weeks if data on cases, occupied beds, or staffing were not reported. Data quality checks indicated that in some cases, facilities might have misinterpreted instructions and that cumulative case counts, rather than weekly case counts, were being entered. Based on the pattern of data entry, if it appeared that cumulative data were entered consecutively, data field values were reassigned to a weekly incident value. Outlier data points were derived using the distribution of facility-level resident and staff member case counts reported on a single collection date among reporting nursing homes over the entire cohort during the data collection period, and any value above the 99.9th percentile (i.e., >55 cases for residents and >37 cases for staff members) was truncated to the corresponding cut-point value. Case count data were aggregated weekly, and resident-weeks were calculated as the total number of occupied beds on the day data were reported. Because data on number of staff members employed is not collected, the proxy denominator of resident-weeks was used as a closest best estimate of the at-risk denominator for staff members. Weekly incidence was calculated for the weekly aggregated data at the end of each calendar week. Cases per 1,000 resident-week were calculated for residents and staff members using the number of COVID-19 cases reported in a week over the corresponding 1,000 resident-weeks. Community COVID-19 rates per 100,000 population were calculated for each of the ten HHS regions as the total number of cases reported in a week over the region’s estimated population, using data available at USAFacts.org (6). Calculations of cases per 100,000 population in Region 2 excluded cases reported from Puerto Rico and in HHS Region 9 excluded cases reported from Guam. Rates among residents and staff members and in the surrounding community were compared by HHS region. Analyses were conducted using SAS software (version 9.4; SAS Institute). This activity was reviewed by CDC and was conducted consistent with applicable federal law and CDC policy.^†

Among 15,404 nursing homes, 15,342 (99.6%) were included in the analysis. Overall, 13,185 (86%) nursing homes had ≥50 beds, 10,750 (70.1%) were for-profit, and 14,349 (93.5%) had dual Medicare and Medicaid certification (Table). Most nursing homes (8,688; 62.2%) were in HHS Regions 4, 5, 6, and 7.

During May 25–November 22, nursing homes reported 572,135 cases to NHSN, 296,762 (51.8%) of which occurred among residents and 275,373 (48.2%) among staff members. Among residents, cases per 1,000 resident-weeks increased during June and July, reaching 11.5 cases per 1,000 resident-weeks (week of July 26), and decreased during August–September (week of September 13 incidence = 6.3 per 1,000 resident-weeks). In November, rates increased again, reaching 23.2 cases per 1,000 resident-weeks (week of November 22) (Figure). Among staff members, cases per 1,000 resident-weeks also increased during June and July, reaching 10.9 cases per 1,000 resident-weeks (week of July 26); incidence then decreased during August and September (week of September 13, 2020 incidence = 6.3 per 1,000 resident-weeks). Incidence among staff members also increased in November, reaching 21.3 cases per 1,000 resident-weeks during the week of November 22 (Figure). Although incidence among residents (10.5 cases per 1,000 resident-weeks) was higher than that among staff members (8.9 per 1,000 resident-weeks) on May 31, during increases in July and November incidence among staff members closely matched that among residents, and trends were similar.

Nursing homes in HHS Regions 1 and 2 reported peak incidences of >10.0 cases per 1,000 resident-weeks among residents and staff members during May or June before rates subsequently declined to <6.0 cases per 1,000 resident-weeks during June–October (Supplementary Figure, https://stacks.cdc.gov/view/cdc/99807). During the July peak, rates among residents and staff members in HHS Regions 4, 6, and 9 ranged from 14 to 24 cases per 1,000 resident-weeks. In HHS Regions 5, 7, and 8, rates ranged from 2.5 to 15 cases per 1,000 resident-weeks during August–September and increased again in November, ranging from 32 to 44 cases per 1,000 resident-weeks during the week of November 22.

During May, population-level COVID-19 rates across the HHS regions ranged from 17 to 67 cases per 100,000 population, and during the July peak, increased to >178 cases per 100,000 in HHS Regions 4, 6, and 9. Rates declined in all HHS regions during August–September and began increasing again in October, with rates in HHS Region 5, 7, and 8 exceeding 615 cases per 100,000 during the week of November 22. For each HHS region, trends in nursing home incidence among residents and staff members were similar to population trends in the surrounding community.

Acknowledgments

Staff members and patients at participating facilities; CDC Division of Healthcare Quality Promotion Team; Lindsey Lastinger, Sujan Reddy, Nimalie Stone, Joseph Perz, Theresa Rowe, CDC.

Corresponding author: Suparna Bagchi, iyj9@cdc.gov.

¹CDC COVID-19 Response Team; ²Centers for Medicare & Medicaid Services.

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Abbreviations: COVID-19 = coronavirus disease 2019, HHS = U.S. Department of Health and Human Services.
* Data source: https://data.medicare.gov/Nursing-Home-Compare/Provider-Info/4pq5-n9py/data. Unknown category includes nursing homes where the information is not available.
^† Unknown represents facilities without information on bed size, facility ownership, and certification
^§ Region 1: Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont; Region 2: New Jersey, New York, and Puerto Rico; Region 3: Delaware, District of Columbia, Maryland, Pennsylvania, Virginia, and West Virginia; Region 4: Alabama, Florida, Georgia, North Carolina, Kentucky, Mississippi, South Carolina, and Tennessee; Region 5: Illinois, Indiana, Michigan, Minnesota, Ohio, and Wisconsin; Region 6: Arkansas, Louisiana, New Mexico, Oklahoma, and Texas; Region 7: Iowa, Kansas, Missouri, and Nebraska; Region 8: Colorado, Montana, North Dakota, South Dakota, Utah, and Wyoming; Region 9: Arizona, California, Hawaii, Nevada, Guam; Region 10: Alaska, Idaho, Oregon, and Washington.

FIGURE. COVID-19 cases* per 1,000 resident-weeks^† among nursing home residents (A) and staff members (B) — United States, May 25–November 22, 2020

Abbreviation: COVID-19 = coronavirus disease 2019.

* Confirmed COVID-19 cases were diagnosed by a positive SARS-CoV-2 viral nucleic acid or antigen test.

^† Resident-weeks were calculated as the total number of occupied beds on the day data were reported.