A Longitudinal, Clinical, and Spatial Epidemiologic Analysis of a Large COVID-19 Long-Term Care Home Outbreak.
Dylan Kain, Nathan Stall, Kevin Brown and 7 others
PMID 34425097WHAT IT FOUND
Most (84.5%) residents with confirmed SARS-CoV-2 had symptoms, not silent infection.
Transmission clustered around roommates and direct care. Universal masking was followed by no further symptomatic staff cases, but the study cannot prove masking caused this.
Key findings
01Of the 97 residents with positive RT-PCR, 84.5% developed symptoms and 15.5% remained asymptomatic; among those with symptoms, 83.5% developed fever, cough, or dyspnea.
02Retrospective review found that 62.5% of the 40 residents who were asymptomatic at facility-wide testing had recently had compatible symptoms.
03On every floor, more than 50% of unaffected residents were exposed to a SARS-CoV-2 roommate at the peak, and symptomatic residents were correctly cohorted on average 43.7% of the time.
STILL TO COME
How it was doneWhat they foundWhat it means for RNs
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What it does not show
This was one long-term care home, so the outbreak size, room layout, and staffing may not match other homes. The records were reviewed after the outbreak, so mild symptoms could have been missed and counted as no symptoms. Staff screening for asymptomatic infection began late, so earlier staff infections may have been missed. The analysis captured direct resident care and room sharing, but missed staff-to-staff, visitor, and object-based spread. No genetic testing was done to confirm where each resident or staff member caught the virus. Testing, protective equipment, staffing, and room-sharing rules changed during the outbreak, so the timing of any change cannot be isolated.
Declared interests
The supplied text does not state funding or author conflict declarations. It says the home's board of directors reviewed and approved the article, and the home is a for-profit entity.
The easy way to misread this
Do not conclude that universal masking prevented staff infections. This was a single-home retrospective outbreak description with no comparison group, and the last symptomatic staff case occurred 9 days after masking started while testing, protective equipment, staffing, and room separation were also changing.