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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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.
Medication errors are three times higher among children and infants than with adults.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
Elderly adults are at greatest risk of stroke and myocardial infarction and have the most to gain from prophylaxis. Patients ages 60 to 80 years with blood pressures above 160/90 mm Hg should benefit from antihypertensive treatment.

