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Mononucleosis: Can it recur?
Mono can return in some rare cases. Learn why that happens.
Mayo Clinic Minute: Why vaccines are especially important for older people
Find out how older people can benefit from vaccines.
Infectious diseases
Viruses, bacteria, fungi and parasites can all cause infection. Find out more about how to prevent and treat these conditions.
Hepatitis C: What happens in end-stage liver disease?
End-stage complications of hepatitis C include liver failure and liver cancer.
Hepatitis C
Many people with this infection don't know they have it. Find out about symptoms and treatment for this liver disease that can be dangerous.
Guillain-Barre syndrome
This rare autoimmune disorder affects the nerves, causing weakness and tingling in the arms and legs that rapidly spreads throughout the body.
Food poisoning
Learn more about foodborne illnesses that can cause upset stomach, vomiting and diarrhea within hours of eating contaminated food.
COVID-19: Who's at higher risk of serious symptoms?
Advanced age and some health conditions can raise the risk of serious COVID-19 (coronavirus disease 2019) illness.
Blood donation
Find out what to expect during blood donation and how your blood will be used to help others.
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