Human flu is a term used to refer to influenza cases caused by Orthomyxoviridae that are endemic to human populations (as opposed to infection relying upon zoonosis). It is an arbitrary categorization scheme, and is not associated with phylogenetics-based taxonomy. Human flu-causing viruses can belong to any of three major influenza-causing Orthomyxoviruses — Influenza A virus, Influenza B virus and Influenza C virus.
The annually updated trivalent influenza vaccine contains two hemagglutinin (HA) surface glycoprotein components from Influenza A virus strains and one from B influenza.
Most human flu is a non-pandemic flu that is slightly different from the main human flus that existed in last year's flu season period. This type of flu is also called "common flu" or "seasonal flu" or "annual flu". It causes yearly flu epidemics that are generally not deadly except to the very old or very young.
Read more about Human Flu: Classification, Characteristics, Impact, Known Subtypes, Influenzavirus B, Influenzavirus C
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“The studio has become the crucible where human genius at the apogee of its development brings back to question not only that which is, but creates anew a fantastic and conventional nature which our weak minds, impotent to harmonize it with existing things, adopt by preference, because the miserable work is our own.”
—Eugène Delacroix (1798–1863)