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It was a typical Tuesday for Mabel Beharrell, 84, until she got the call that would turn her world upside down. Her teenaged grandson was in trouble and needed her help.
A new study out of the U.K. has revealed most people who test positive for COVID-19 remain infectious after five days from their first sight of symptoms.
Researchers at Imperial College London followed a group of people who developed mild cases of COVID-19 to better understand when and for how long they remain infectious.
The study followed 57 people in various households who tested positive for COVID-19 and found two thirds of the participants remained infectious five days after their symptoms started showing. Additionally, one quarter were still infectious seven days after their initial symptoms.
Published in the peer-reviewed The Lancet Respiratory Medicine journal on Thursday, the study found one in five people were contagious before they started showing symptoms, suggesting the majority of those infected with COVID-19 are not likely to be infectious before symptoms develop.
The study group endured daily symptom reporting and tests, including both PCR and lateral flow testing, more commonly known as rapid tests. Through this, the researchers found lateral flow tests are not reliable for detecting the start of infection, but can be useful in determining when to shorten the quarantine period.
“Our study finds that infectiousness usually begins soon after you develop COVID-19 symptoms. We recommend that anyone who has been exposed to the virus and has symptoms isolates for five days, then uses daily lateral flow tests to safely leave isolation when two consecutive daily tests are negative,” said lead researcher Ajit Lalvani in a press release.
The study period took place between the pre-Alpha and Alpha variant waves in 2020 and Delta variant wave in 2021. While the study pre-dates the most recent wave of the Omicron variant and its sub-variants, the lead researchers say the length of infectiousness is likely similar as other variants.
Similar to the U.K., the majority of COVID-19 guidelines in Canada recommend people self-isolate for five days after showing symptoms, and can end their quarantine after five days if their symptoms don’t persist.
However, authors of the new study stress the importance of following self-isolation guidelines, regardless of whether they are mandated.
“There is no longer a legal requirement to self-isolate if you test positive for COVID-19 [in the U.K.] but most people still want to isolate until they are not infectious,” co-author Seran Hakki said in the release.
“Our study is the first to assess how long infectiousness lasts for, using real life evidence from naturally acquired infection. Our findings can thus inform guidance as to how to safely end self-isolation.”
It was a typical Tuesday for Mabel Beharrell, 84, until she got the call that would turn her world upside down. Her teenaged grandson was in trouble and needed her help.
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