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Cellulitis is a skin infection, usually caused by Streptococcus or Staphylococcus bacteria. Cellulitis usually develops after a

Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a disease that causes someone to feel so ill that they can't do

Chronic obstructive pulmonary disease (COPD) is a lung disease that makes it hard to breathe. With COPD, the airways that lead to

Chromosomes are part of most types of cells in the body. Each chromosome has a single molecule of DNA. Humans have 46 chromosomes

Chorionic villus sampling (CVS) is a test done during early pregnancy that can find certain problems with an unborn baby (fetus)

Cholesterol is an important type of fat (lipid) that is made by the body. It is needed for the body to function. It also is found

Cholera is a serious bacterial infection of the small intestine caused by Vibrio cholerae. It is spread through contaminated water

Chlamydia (say "kluh-MID-ee-uh") is an infection caused by bacteria. In many cases, it's spread through sexual contact (sexually

Chiropractic is an approach to health care that tries to relieve pain through spinal manipulation. It is most often used for back

Chickenpox (varicella) is an illness that causes an itchy rash and red spots or blisters all over the body. The blisters burst and