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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.
Medication errors are more common among seriously ill patients than with those with minor conditions.
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.
Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.
Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.