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J Am Med Dir Assoc ; 22(10): 2003-2008.e2, 2021 10.
Article in English | MEDLINE | ID: mdl-34425097

ABSTRACT

OBJECTIVES: COVID-19 has had devastating effects on long-term care homes across much of the world, and especially within Canada, with more than 50% of the mortality from COVID-19 in 2020 in these homes. Understanding the way in which the virus spreads within these homes is critical to preventing further outbreaks. DESIGN: Retrospective chart review. SETTINGS AND PARTICIPANTS: Long-term care home residents and staff in Ontario, Canada. METHODS: We conducted a longitudinal study of a large long-term care home COVID-19 outbreak in Ontario, Canada, using electronic medical records, public health records, staff assignments, and resident room locations to spatially map the outbreak through the facility. RESULTS: By analyzing the outbreak longitudinally, we were able to draw 3 important conclusions: (1) 84.5% had typical COVID-19 symptoms and only 15.5% of residents had asymptomatic infection; (2) there was a high attack rate of 85.8%, which appeared to be explained by a high degree of interconnectedness within the home exacerbated by staffing shortages; and (3) clustering of infections within multibedded rooms was common. CONCLUSION AND IMPLICATIONS: Low rates of asymptomatic infection suggest that symptom-based screening in residents remains very important for detecting outbreaks, a high degree of interconnectedness explains the high attack rate, and there is a need for improved guidance for homes with multibedded rooms on optimizing resident room movement to mitigate spread of COVID-19 in long-term care homes.


Subject(s)
COVID-19 , Long-Term Care , Disease Outbreaks , Humans , Longitudinal Studies , Nursing Homes , Ontario/epidemiology , Retrospective Studies , SARS-CoV-2
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