Do a lucky few have a kind of biological armor against infection? Scientists are just beginning to unlock the mystery of the true Covid dodgers.
Immunity acquired from Covid infection as protective as vaccination against severe illness and death.
That is, people never knew they had Covid because their body stopped the virus from making them sick — no cough, no fever, no trouble breathing.conducted early in the pandemic, when routine testing was common, suggested that more than 40% of cases could be asymptomatic. The CDC stopped trying to track the percentage of asymptomatic cases when regular testing became less common."What is it that clears the virus before it gets a foothold?," he asked.
Sometimes HLA holds up something that the immune system doesn't recognize, such as a virus like Covid. That's when it is supposed to launch an attack. "That would be important because that's really what we want to achieve in the population," Iwasaki said. Hollenbach said that it appears people whose immune systems include the form of the HLA gene also have a fantastic ability to remember prior infections, jumping into action immediately when it finds something menacing that's been there before.
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