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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.