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IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.
During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
In 1864, the first barbiturate (barbituric acid) was synthesized.
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.