With breakthrough infections, Delta variant rising, what should I do to protect myself?
in people who had been fully vaccinated. Among the 133 viral samples that were genetically sequenced, 90% were caused by the Delta variant or an offshoot of the strain.
The confidential CDC document also cites discouraging reports about breakthrough cases in India, where the Delta variant was first detected. The viral loads of vaccinated people who became infected with Delta were higher than the viral loads of vaccinated people who became infected with other coronavirus strains, those reports found.
Going forward, health officials will have to “improve [the] public’s understanding of breakthrough infections” and stop “describing breakthrough cases as ‘rare’ or as a ‘small percentage’ of cases,” the document says.Overall, it now appears that the Delta variant poses more risks than initially thought but that the vaccines available in the U.S. still offer strong protection., an immunologist at the Mayo Clinic in Rochester, Minn.
That difference allows Delta to jump from person to person just four days after an initial infection, said, director of the Center for Global Health at Oregon State University. With previous strains, it took about six days for that to occur, he said. This rapid spread helps explain why the Delta variant, which is thought to have arrived in the U.S. in March, now accounts forThe data on whether Delta causes more serious illness is less certain. The CDC document cited several studies, some of them preliminary, suggesting that Delta infections were more likely to lead to serious illnesses that require hospital care.
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