Influenza
Classification and external resources
Influenza virus, magnified approximately 100,000 times
ICD-10	J10., J11.
ICD-9	487
DiseasesDB	6791
MedlinePlus	000080
eMedicine	med/1170 ped/3006
MeSH	D007251

Influenza, better known as the flu and sometimes called the grippe, is a common childhood illness, but is not as common among adults. It is not limited to humans, most mammals and many birds can also catch influenza. It is caused by several different viruses, termed influenza viruses A, B, C, and D.