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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.
Approximately 25% of all reported medication errors result from some kind of name confusion.
The longest a person has survived after a heart transplant is 24 years.
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.
As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.