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Dec 12, 2021 · Fully vaccinated people in England who are close contacts of Covid cases will be told to take daily lateral flow tests for seven days from Tuesday. Those who test positive, develop symptoms, or...
- Sophie Gallagher
Dec 6, 2021 · If you're identified as a close contact of someone with the Omicron variant of COVID-19 PCR tests are genome-sequenced to identify COVID variants. If an Omicron case is identified, NHS Test and Trace will get in touch with cases and contacts to let them know.
- Overview
- Close contacts
Prolonged exposure in close proximity to someone with COVID-19 puts people at high risk of catching the disease, even if they’ve had both the disease and vaccinations against it, a study1 shows.
The work, published this month in Nature Communications, reveals that the greater a person’s exposure to SARS-CoV-2, the more vulnerable they are to infection, regardless of their vaccination status. This relationship has long been suspected, but the study is one of the first to document it.
The findings point to the importance of masking, improved ventilation and other measures that reduce exposure to the virus, says Akiko Iwasaki, an immunobiologist at Yale University in New Haven, Connecticut, who was not part of the study.
The finding “just makes intuitive sense”, she says. “But now there’s evidence that these [measures] are probably going to be important to help the vaccine-mediated immunity work for you.”
Scientists have speculated since the start of the pandemic that the likelihood of SARS-CoV-2 infection correlates with the amount of virus that a person is exposed to. But verifying this relationship has been difficult because of the challenges in quantifying how much time people spend in close contact with others, and in tracking infections after such contact.
To procure such data, the study’s authors turned to 13 correctional facilities in Connecticut that regularly conducted SARS-CoV-2 tests on residents without symptoms. The researchers assigned ‘close exposure’ status to anyone who shared a cell with an infected person, and ‘moderate’ exposure status to those who shared a cell block but not a cell with an infected resident. Those who lived in separate cell blocks from anyone known to be infected were designated as having no documented exposure.
Dec 24, 2021 · Omicron can cause cold-level symptoms such as a sore throat, runny nose and a headache, but that does not mean it will be mild for everyone and some will still be seriously ill. Changes to the...
Dec 6, 2021 · How do you detect Omicron? Do variants mean we need new vaccines? How many cases are there in the UK? Why has the Delta variant spread so quickly in UK?
Nov 27, 2021 · The Omicron coronavirus variant is "not a disaster" and some people may be "hugely overstating the situation", a scientist advising the government says. Omicron has been labelled "of...
Dec 23, 2021 · The latest findings from Imperial College London and Ipsos MORI, covering 23 November to 14 December 2021 (round 16 of the study), detected 11 cases of the Omicron variant for data sequenced up...
