With the rise of omicron came the fall of long-lasting protection from reinfection with the pandemic coronavirus SARS-CoV-2, according to a study published in Nature. Using population-wide data from ...

(CNN) — A shot of the latest Covid-19 vaccine can help cut the chances of getting a symptomatic infection by half, early data from the US Centers for Disease Control and Prevention suggests. Vaccine ...

DEAR DR. ROACH: My daughter was recently visiting and tested positive for COVID. Since my last COVID vaccine was eight months ago, I searched for how much protection I still had and understood the ...

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