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Learning Center
COVID-19: Long-term effects
Learn about the possible long-term effects of COVID-19.
How do COVID-19 antibody tests differ from diagnostic tests?
Antibody testing shows whether you've had the COVID-19 virus in the past. It's not the same as testing to see whether you have the virus now.
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.
Bleeding during pregnancy
Learn what may cause vaginal bleeding during pregnancy and when you should see a doctor about it.
Breast calcifications
Most breast calcifications are benign. Find out more about what can cause them, what they look like, and when to see a doctor.
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