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Approximately 500,000 babies are born each year in the United States to teenage mothers.
After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.