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Hace 17 horas · Influenza, commonly known as " the flu " or just " flu ", is an infectious disease caused by influenza viruses. Symptoms range from mild to severe and often include fever, runny nose, sore throat, muscle pain, headache, coughing, and fatigue. These symptoms begin one to four (typically two) days after exposure to the virus and last for about ...
Hace 17 horas · Hasta ahora ha habido cuatro pandemias de esta enfermedad: la cepa de la gripe de 1918, que era del tipo H1N1 y de origen aviar y causó la mayor pandemia de gripe de la historia, con 20-40 ...
