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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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.
Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.