Immunity has been on everyone8217;s lips since the pandemic began. Now, it8217;s more pressing than ever, as infections rapidly rise in parts. Immunity depends on antibodies 8211; proteins in the bloodstream that fight pathogens and viruses. Their production depends on the severity of an infection. But immunity from COVID may only last a short period. The elderly show a significantly faster reduction in antibodies than the young. There8217;s also evidence that some people don’t develop immunity at all.
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