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https://en.wikipedia.org › wiki › Influenza
Most of the burden of influenza is a result of flu seasons caused by influenza A virus and influenza B virus Among influenza A virus

https://pmc.ncbi.nlm.nih.gov › articles
Influenza viruses are significant human respiratory pathogens that cause both seasonal endemic infections and periodic

https://www.healthline.com › health › flu-causes
The flu is a contagious respiratory illness caused by a virus that infects the nose throat and lungs and it can be

https://biologyinsights.com › what-causes-the-flu-influenza-viruses-explained
The flu is caused by influenza viruses a family of respiratory viruses that infect the nose throat and lungs Four types

https://www.cdc.gov › flu › about
Flu is a contagious respiratory illness caused by influenza viruses that infect tissues in the nose throat and

https://en.wikipedia.org › wiki › Influenza_A_virus
Influenza A virus Influenza A virus or IAV is a pathogen with strains that cause seasonal flu in humans it can also infect birds

https://www.who.int › news-room › fact-sheets › detail › influenza-(seasonal)
There are 4 types of influenza viruses types A B C and D Influenza A and B viruses circulate and cause seasonal

https://www.webmd.com › cold-and-flu › what-causes-flu-viruses
While more than 100 different viruses can cause a cold only influenza virus types A B and C cause the flu Types A

https://www.msdmanuals.com › ... › respiratory-viruses › influenza
Influenza is a viral illness caused by influenza viruses It most commonly leads to fever coryza cough headache and malaise