How protected are we against Covid-19? Scientists search for a test to measure immunity - CNN

As mask mandates are lifted and restrictions removed in a step towards normalcy, having a test that could measure immunity would be a powerful tool to assess individual risk.

(CNN)In 2010, doctors told Ben Sobieck, now 37, that his kidneys were inexplicably failing. Shortly after, he had a kidney transplant and started on the lifelong medications that weaken his immune sy… [+10257 chars]

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