Scientists are testing vaccines and new treatments in the fight to stop the spread of the new flu strain.
Lyme disease is the most prevalent tickborne infectious disease in the United States.
Each year, 56,300 people in the U.S. become infected with HIV, and roughly 33 million people worldwide are living with HIV.
Food allergy occurs in 6-8 percent of children 4 years of age or under, and in 3.7 percent of adults.
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