New research raises the possibility that some of us may be partially protected due to past encounters with “common cold” coronaviruses. COVID19
providing evidence the T cell responses may derive in part from memory of “common cold” coronaviruses.“The immune system is basically a memory machine,” he said. “It remembers and fights back stronger.”
The results were intriguing: Seven types of vaccines given one, two or five years in the past were associated with having a lower rate of infection with the new coronavirus. Two vaccines in particular seemed to show stronger links: People who got a pneumonia vaccine in the recent past appeared to have a 28 percent reduction in coronavirus risk.
At NIH headquarters in Bethesda, Md., meanwhile, Alkis Togias has been laser-focused on one group of the mildly impacted: children. He wondered if it might have something to do with the receptor known as ACE2, through which the virus hitchhikes into the body. “We are thinking allergic reactions may protect you by down-regulating the receptor,” he said. “It’s only a theory of course.”
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