Study shows vaccines may protect against new COVID-19 strains—and maybe the common cold

A new study by Johns Hopkins Medicine researchers provides evidence that CD4+ T lymphocytes—immune system cells also known as helper T cells—produced by people who have received either of the two messenger RNA (mRNA) vaccines for COVID-19 caused by the original SARS-CoV-2 strain also will recognize the mutant variants of the coronavirus that are rapidly becoming the dominant types worldwide.


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