发信人: stm32 (www), 信区: Military
标 题: Re: 秋季的新毒王可能在delta内斗中产生
发信站: BBS 未名空间站 (Wed Oct 13 08:28:59 2021, 美东)
The Nevada State Public Health Laboratory has identified a rare case of
COVID-19 reinfection occurring just 22 days after the patient first tested
The patient, an unvaccinated 31-year-old Mineral County man with no
underlying health conditions, first tested positive for the delta variant
and then, three weeks later, for a different strain that evolved from the
delta variant, Mark Pandori, director of the lab at the University of Nevada
, Reno’s School of Medicine, told the Review-Journal this week.
Infection from COVID-19 typically results in immunity from reinfection for a
minimum of several months, according to the Centers for Disease Control and
Prevention. Such rapid reinfection, especially in a young and healthy
individual, could mean that the virus has mutated to a degree that makes it
more resistant than previously seen to the protection afforded by past
infection or from vaccination.
More such reinfections would first need to be identified to know if this is
“We don’t know how widespread the phenomenon is right now, but it implies
that the virus is definitely going to be fine in terms of staying in
circulation in the population,” given how much the strain that caused the
reinfection differs from the delta variant, he said.
The strain, a sublineage of delta known as AY.26, has 31 genetic differences
from delta, including on the spike protein, the part of the virus targeted
by vaccines, he said. It is this genetic variety that especially concerns
“My concern is that there’s a scientific rationale for this being
indicative of a bigger problem,” said Pandori, whose lab in August 2020
reported the first known case of COVID-19 reinfection in North America.
That bigger problem is the possibility of increasing numbers of reinfections
as well as so-called breakthrough cases in vaccinated individuals.
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