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Sperm: How long do they live after ejaculation?
After ejaculation, the life span of sperm depends on the circumstances.
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Mononucleosis: Can it recur?
Mono can return in some rare cases. Learn why that happens.
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COVID-19 drugs: Are there any that work?
Medicine can help people who are at risk of, diagnosed with, or have symptoms of COVID-19.
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Unusual COVID-19 symptoms: What are they?
COVID-19 can cause a wide variety of symptoms, some more common than others. Learn about how COVID-19 can make you feel.
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Can vitamin D protect against coronavirus disease 2019 (COVID-19)?
Find out what the research says about links between this key vitamin and the widespread viral infection.
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