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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.
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.