Definition o
shortened form of influenza-a highly contagious upper respiratory
Examples of Flu in a sen
Although there are vaccines to defend against the virus, flu strains vary and can’t fully be protected against. 
A flu epidemic swept through the U.S. in 1918, with the virus killing over 20 million people in two years. 
Because it is a virus, the flu cannot be fully irradicated like bacterial diseases. 
Struggling to breathe and burning up with fever, the patient was diagnosed with viral flu type A. 
Getting a flu immunization early in the season can help workers prevent getting the virus and struggling with a lung infection later on. 
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