Conjunto de características que distinguen a un individuo de sus congéneres, dentro de una colectividad estudiada

Typical flu symptoms include fever, cough, sore throat, muscle aches, headaches, runny or stuffy nose, fatigue and, sometimes, vomiting and diarrhea, according to the CDC. Flu symptoms often come on suddenly. Most people who get the flu will recover in less than two weeks. But in some people, the flu causes complications, including pneumonia. So far this flu season, about 1% of people in the United States have developed symptoms severe enough to be hospitalized. And the overall hospitalization rate in the U.S. this season is 61 hospitalizations per 100,000 people.e flu (also called influenza)

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