A Hong Kong hamster that evaded the cull. Bertha Wang/AFP via Getty Images hide caption
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immuno-compromised
Friday
Friday
The CDC recommended that people with weakened immune systems get a third shot of either the Pfizer-BioNTech or Moderna vaccine. The move follows the FDA's authorization of such use a day earlier. Patrick T. Fallon/AFP via Getty Images hide caption
Monday
A computer-enhanced image of the HIV virus. Callista Images/Getty Images/Image Source hide caption