Influenza A virus or more known to us as H5N1 is an avian (bird)
flu, an influenza A subtype that has caused outbreaks in
domestic poultry in parts of Asia and the Middle East. This is
deadly to them and is considered “highly pathogenic” meaning
highly disease causing. Although the virus does not usually
infect people but infectious that these viruses occurred in
humans. Most of these cases have resulted from people having
direct or close contact with H5N1-infected poultry or
H5N1-contaminated surfaces. There are three types of viruses, A,
B, and C, that can cause flu to human. The type A is
characterized not only to human but to other mammals and birds
too. The virus transmitted by air. The type A virus is composed
of two obligatory protein components. One is called
hemagglutinin and is lettered H, and the other—neuraminidase
(N). And there are 13 variants of hemagglutinin and 9 of
neuraminidase, which then can characterized what type of virus
it is. Making H5N1 is just out of the many possible variants of
t