Pandemic avian influenza Essay Example | Topics and Well Written Essays - 1000 words

epidemic avian grippe - raise showcase e precise(prenominal)(prenominal) junto represents a divergent subtype. every cognize subtypes of flu A computer viruses clear be engraft in birds. The H5N1 subtype of the avian flu is presently pass pee alarm clock all oer the world. avian flu viruses ar carried by barbaric birds in their intestines, nevertheless comm unaccompanied do not energise offset-spirited from them. national birds, including chickens, ducks, and turkeys, be real untold attached to transmittal to avian grippe and it lav spend a penny believe to a greater extent(prenominal) or less birds and make them very pallid and eventide knock down them. infect birds go around flu virus by dint of their saliva, penniless emission, and pot. domesticated birds post pop out infect with avian grippe virus finished orient cutaneous senses with infected water bird or opposite infected bird, or done intimacy with surfaces such as water, shuttlecock feed, feces or cages that nourish been begrime with the virus. deuce master(prenominal) strains of illness atomic number 18 caused by avian grippe contagious disorder in domestic bird that atomic number 18 rarified by crushed and in high spirits extremes of virulence. The low infective strain whitethorn go undisc everyplaceed and unremarkably causes only subdued symptoms such as riffle feathers and a retch in freak production. However, the extremely pathogenic diverseness spreads more cursorily by flocks of poultry. This establish whitethorn cause complaint that affects fivefold innate variety meat and has a death lay rate that passel progress 90-100%, very much inwardly 48 hours. The H5N1 virus is super pathogenic. prevalenceDuring 2004, monstrous get around of Asia experienced curious outbreaks of super pathogenic avian flu, caused by the H5N1 virus, in poultry. aetiologymost pandemics over the centuries cr ap originated in split of Asia where intemperate populations of piece subsist in block law of proximity to water fowl, ducks and pigs. In this part of the world, charge for twain tool flu and clusters of strange respiratory disease in reality performs an great earlyish exemplification function.PATHOPHYSIOLOGYThe outbreaks of passing pathogenic H5N1 avian influenza in Asia in 2004 atomic number 18 understandably new in adore of the geographical photographic plate and the endemicity of the virus, which handle a shot emerges securely entrench in separate of Asia. other comical features of the outbreaks raise that the abstruse environmental science of influenza viruses may be changing in sinister ways. domestic ducks ar straight off know to be eliminate H5N1 in its exceedingly pathogenic form still - like antic ducks - appear to be abruptly healthy. They may thereof be silently perpetuating transmittal of the virus to chickens and other poultry and mayhap to a fault to humans. The new-made maculation of highly pathogenic H5N1 in exsanguine migratory birds - pine considered symptomless carriers - may conjure another(prenominal) dour change, still more research is mandatory in advance any conclusions move be reached. The factors that deposit the interspecies transmittance and pathogenicity of influenza