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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
Blood is approximately twice as thick as water because of the cells and other components found in it.
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.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.