The agency says science shows the majority of transmission 'occurs early in the course of illness.'
over the holiday weekend, as pilots, flight attendants and other airline workers were forced to isolate after breakthrough cases.
In deciding to shorten the recommended isolation period, the CDC said data shows the majority of transmission"occurs early in the course of illness," within two days before symptoms begin and three days after. The CDC also cited recent data from South Africa and the United Kingdom, where Omicron has spread widely, showing a booster shot could restore vaccine effectiveness against infection.by health authorities in the U.K. found that vaccine effectiveness against symptomatic infection from the Omicron variant was around 70% among those who had received a Pfizer booster recently, but dropped to 45% after at least 10 weeks.
Officials stress that being vaccinated and boosted provides strong protection against serious illness and hospitalization if a person does get infected.
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