|
|
Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.
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.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.