Infant health
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Mononucleosis: Can it recur?
Mono can return in some rare cases. Learn why that happens.
Answer
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.
Answer
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.
Answer
Is a home sperm test useful?
Using a home sperm test to check your fertility may not provide a clear answer.
Answer
COVID-19 variants: What's the concern?
The virus that causes COVID-19 has changed over time, which has affected prevention, diagnosis and treatment of COVID-19.
Answer
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