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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
According to the American College of Allergy, Asthma & Immunology, more than 50 million Americans have some kind of food allergy. Food allergies affect between 4 and 6% of children, and 4% of adults, according to the CDC. The most common food allergies include shellfish, peanuts, walnuts, fish, eggs, milk, and soy.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.
The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.