Bird Flu

Avian flu (Bird Flu) An grippe pandemic is a orbicular outbreak of disease that occurs when a parvenu flu A virus appears or emerges in the human population, causes serious illness, and whence spreads easily from psyche to person worldwide. Pandemics atomic number 18 different from seasonal worker outbreaks or epidemics of influenza. Seasonal outbreaks are caused by subtypes of influenza viruses that are already in existence among large number, whereas pandemic outbreaks are caused by sweet subtypes or by subtypes that have never circulated among citizenry or that have not circulated among people for a hanker time. Past influenza pandemics have led to high levels of illness, death, complaisant disruption, and economic loss. There are many different subtypes of Influenza or flu viruses. The subtypes differ based upon certain proteins on the find of the virus (the hemagglutinin or HA protein and the neuraminidase or the NA protein). Pandemic viruses appear (or emerge) as a conduct of a process called antigenic shift, which causes an abrupt or sudden, study change in influenza A viruses. These changes are caused by new combinations of the HA and/or NA proteins on the surface of the virus. This change results in a new influenza A virus subtype.

The appearance of a new influenza A virus subtype is the first step toward a pandemic, but the new virus subtype also must spread easily from person to person to cause a pandemic. Once a new pandemic influenza virus emerges and spreads, it normally becomes established among people and moves around or circulates for many years as seasonal epidemics of influenza. The U.S. Centers for Disease Control and Prevention and the World Health organization have large surveillance programs to monitor and detect influenza activity around the world, including the emergence of possible pandemic strains of influenza virus. (The Washington Times A21) There are growing fears of an influenza pandemic as avian flu sweeps through domestic fowl stocks across Asia.... If you want to get a full essay, regularize it on our website: Orderessay

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