Quarantine time after contact with a confirmed COVID-19 case could potentially be reduced to 7 days without raising the risk of onward transmission of the virus by testing people on the seventh day of quarantine with either a PCR or lateral flow antigen (LFA) test, findings from an English modelling study published today in The Lancet Public Health journal suggest.

The study, which accounts for infected people’s potential viral load and the sensitivity of COVID-19 tests, estimates that people who test negative after 7 days of quarantine are unlikely to be infectious and could potentially be released without raising the risk of onward virus transmission above what would be expected by quarantining for 14 days without testing.


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