https://www.applevalleynewsnow.com/news/health/covid-19-has-changed-and-so-has-our-immunity-here-s-how-to-think-about/article_db756f7a-ff60-56b5-addf-e66537d7e4fe.html
(CNN) — Covid-19 was never just another cold. We knew it was going to stick around and keep changing to try to get the upper hand on our immune systems.
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