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Illness from Omicron Variant Shorter Than from Delta, UK Finds

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Disease caused by the omicron variant is on average around two days shorter than the delta variant, a large study of vaccinated Britons who kept a smartphone log of their COVID-19 symptoms after breakthrough infections found.

“The shorter presentation of symptoms suggests — pending confirmation from viral load studies — that the period of infectiousness might be shorter, which would in turn impact workplace health policies and public health guidance,” the study authors wrote.

Based on the Zoe COVID app, which collects data on self-reported symptoms, the study also found that a symptomatic omicron infection was 25% less likely to result in hospital admission than in a case of delta.

While omicron’s lesser severity has been known, the study is unique in its detailed analysis and in that it corrected for any distortions caused by differences in vaccination status by looking at vaccinated volunteers only.

The researchers at King’s College London analyzed two sets of data from June 1 to Nov. 27, 2021, when the delta variant accounted for more than 70% of cases, and from Dec. 20, 2021, to Jan. 17, 2022, when omicron was more than 70% prevalent.

The patients, close to 5,000 in each group, were matched and compared 1:1 with a person of the same age, sex, and vaccination dose in the other group.

Omicron’s shorter symptom duration relative to delta was more pronounced in those with three vaccine doses. Symptoms lasted 7.7 days on average during the delta-dominated period, and only 4.4 days, or 3.3 days less, during the omicron period.

Among those with only two vaccine doses, symptoms from delta lasted for 9.6 days and 8.3 days from omicron, a difference of just 1.3 days.

The Zoe COVID Study application, previously known as the COVID Symptoms Study App, collects data on self-reported symptoms.

The company ZOE Ltd was initially founded to offer customized nutritional advice based on test kits. Its app is a not-for-profit initiative in collaboration with King’s College London and funded by the Department of Health and Social Care.

The study was published in the medical journal The Lancet on Thursday and will be presented at the European Congress of Clinical Microbiology and Infectious Diseases later this month.
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08/04/2022 Lev

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Почалася 44-та доба війни РФ проти України: Генштаб ЗСУ розповів про ситуацію на фронті → ← Pink Floyd присвячує Україні свою першу з 1994 року нову пісню. Її співавтором став Андрій Хливнюк

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