A Temporary History of the Avian Influenza H5N1 Virus

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Although many alternative influenza viruses infect birds and have for many years, the history of the avian influenza H5N1 virus in people is comparatively brief, because the primary cases noted occurred in 2003 in China and Viet Nam, according to the World Health Organization (WHO). The WHO only reports confirmed cases, in which the presence of H5N1 avian influenza microbes have been detected utilizing blood tests or swabs of the infected person’s nose or throat.

Wild birds carry the viruses, but they are often unaffected by them. Nonetheless, in domesticated birds (chickens, ducks and turkeys) the viruses cause illness and sometimes death. Symptoms could also be delicate causing ruffled feathers and low egg production or severe causing disease that affects a number of organs and demise in ninety-100% of flocks in as little as 48 hours. It is believed that the degree of difference in avian flu symptoms is said to the strain of the flu virus infecting the birds. H5N1 avian influenza microbes cause severe symptoms in poultry and in lots of cases total flocks must be destroyed to prevent the spread of the disease.

An infection with avian influenza microbes among people is rare and usually occurs in individuals handling or tending contaminated flocks of poultry and most strains, causing only delicate illnesses. The history of the avian influenza H5N1 virus has shown that this strain will be deadly to people as well. There have been 253 confirmed cases in people since 2003, leading to 148 deaths. This high share of fatalities (fifty eight%) following an infection with avian influenza microbes has scientists and public health officers all through the world worried.

Viruses normally change slowly over time and the human immune system can identify them, because they’re so just like beforehand current viruses and respond to them quickly. On uncommon occasions previously, viruses have changed suddenly, referred to as “antigenic shift”, causing severe illness, numerous human deaths and worldwide epidemics. Typically these viruses had not beforehand infected humans, but had contaminated different animals, equivalent to pigs or birds. Or, they had not been highly contagious amongst people, as with the H5N1 strain, however all of a sudden change and grow to be simply transmitted from one human to another. Because the history of the avian influenza H5N1 virus has shown that it could actually infect humans, scientists imagine that it may turn out to be highly contagious among them, inflicting pandemics or worldwide epidemics. Scientists consider that only proteins within the H5N1 avian influenza microbes would want to vary in order for it to become as easily transmitted among people because the seasonal flu.

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