Which is a serious respiratory virus that strikes from November through April, and causes the death of as many as 20,000 people annually?

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Influenza, commonly known as the flu, is a serious respiratory virus that typically strikes from November through April and can cause the death of as many as 20,000 people annually. Pneumonia and pneumococcal disease can also be serious respiratory illnesses, but they are not seasonal like the flu. Respiratory syncytial virus (RSV) primarily affects young children and infants and is not typically associated with as high a mortality rate as the flu.

Which Is a Serious Respiratory Virus That Strikes from November