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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.