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And here's the kicker: These special T cells likely arose in the health care workers before the pandemic began. Their immune systems likely generated them when the workers were infected with another of the several coronaviruses that can strike humans.
"We don't know that for sure, but the most likely candidate would be the common cold coronaviruses that we're all exposed to," Maini says.
About 30% of colds are caused by four other coronaviruses known as seasonal coronaviruses (because they typically come around in winter and cause winter colds). These viruses circulate around the world and have been making people sick for decades, perhaps even centuries. Basically every kid catches all four of them before age 5 or 6.
originally posted by: ketsuko
a reply to: musicismagic
There will always be a certain percentage of people who will be immune to any given disease. It's just a by product of natural genetic variance.