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Learning Center
Mononucleosis: Can it recur?
Mono can return in some rare cases. Learn why that happens.
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.
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.
Fundal height: An accurate sign of fetal growth?
Understand how fundal height is measured and what it means.
Male masturbation: Does frequency affect male fertility?
Male masturbation has little effect on sperm count or quality.
Silicone breast implants: What happens if they rupture?
Understand the health effects of ruptured silicone breast implants.
Thin skin? Added protection helps
Fragile or thin skin is a fairly common problem, especially in older adults.
Lack of sleep: Can it make you sick?
Lack of sleep can affect your immune system. Here's what you need to know.
What is thirdhand smoke, and why is it a concern?
Tobacco smoke creates toxic residue that clings to walls, carpets, clothes and other surfaces.
Tinnitus causes: Could my antidepressant be the culprit?
Ringing in the ears, also known as tinnitus, has many possible causes, such as taking antidepressants.
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