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How do you determine if a COVID-19 infection was caught in a health care setting?

The NHS uses established national (UK) definitions, which are endorsed by Public Health Wales.  These definitions set out how likely it is that an infection is healthcare caught by the number of days following admission to hospital/healthcare environment and when testing positive for COVID-19 was confirmed. Generally, a person is said to have probable nosocomial COVID-19 if they test positive for COVID-19 after 8 days of receiving care.  However, this is not a concrete rule and there will be occasions where organisations will need to consider the likelihood of infection transmission between 3-7 days, which is classified as indeterminate acquisition, this is due to the incubation period of COVID-19 and other risk factors, such as exposure to the virus.