Viral disease highly fatal epidemic and affects poultry, causingsymptoms ranging from a wide range of severe to moderate.Discovered bird flu in humans for the first time in the spread ofHong Kong in 1997, where the deadly influenza A (H5N1) andmortality for 6 of 18 people infected with the virus.
Pathogen:
* Known to be caused by influenza viruses, 3 kinds of ABC typebc humans only. Influenza virus type A strains are from humansand other birds, and other horses and pigs. All strains of influenza A infect birds.* There are genetic differences under the different strains of Type A, depending on the type carried by the protein on the surface ofthe virus from 16 Haemagglutin H and 9 Neuraminidase N
Haemagglutin = for virus attachment
Neuraminidase = for virus penetration and release from host cells
* The pathogenesis of most strains of the human person is the H5 and H7, which has a series of several amino acids and the H9influenza virus pathogenicity is less where the recorded cases of it in people:
A - avian H9 A: There are different strains of it 9, may have apathogenesis very high or low, affect humans causing serious illness and death
B - Avian H7 A: There are different strains of it 9, may have anattic or low pathogenicity
Rarely affect humans, but may occur in persons with direct contact with infected birds, symptoms include inflammation of theeye, with or upper respiratory symptoms.
C - Avian H9 A: There are different strains than 9, it is classified as a low-pathogenicity
Confirmed at least 3 goals in his rights. H9N2
* Pandemic influenza viruses occur as a result of mutation of the virus is called antigenic shift results in a sudden and majorchange in influenza A viruses, these changes occur as a result ofa new union of proteins Haemagglutinin HA or Neuramindase NAon the surface of the virus. The emergence of new strains ofinfluenza A is the first step towards the outbreak may spread the new type is transmitted from person to person.
* There are three strains of influenza viruses only Adamic type A H1N1-H1N2-H3N2.
* H5N1 virus is a strain of influenza A virus that mainly affects birds and is spread in an epidemic that can be fatal.
* Secreted the virus from infected birds in saliva, nasal secretionsand feces.
* HIV is very sensitive, die cleaners, disinfectants, and kill it, cooka few seconds at a temperature of 70 ° C.
التسميات
flu