The occurrence of the spread of avian flu and climate conditions?

Published :2009-01-08 09:11:13.0

Core prompted Beijing Health Bureau inform the January 6, Beijing confirmed case of human infection of highly pathogenic avian influenza cases. Patients in December 24, 2008 incidence, January 5, 2009 death. This female patient from Fujian Province, before the onset of a market in Hebei Province bought nine ducks and duck Ripper liquidation.

According to China's weather network editor January 8 that the latest news, Beijing, Tianjin, Hebei, three found no other cases of suspected bird flu. Medical experts also told Beijing residents in particular, the avian flu spread from person to person almost zero probability.

Then, the bird flu virus whether the generation and dissemination of meteorological conditions and status?

Weather experts: low-temperature or severe cooling in favor of the avian flu virus survival and spread of

Avian influenza is caused by the bird flu virus in an acute infectious disease can also infect humans. Avian flu pandemic must have four elements, namely, the virus source, receptors, the proliferation of media (migratory birds), environmental conditions, these four conditions are indispensable, of which the latter two (the proliferation of media, environmental conditions) and weather-related. Weather conditions on the avian flu epidemic occurred in the following areas:

Viability of the avian flu virus closely related with the weather conditions

Laboratory studies have shown that high temperatures and strong ultraviolet rays of the bird flu virus has消杀strong role, while the low temperature and weak light is conducive to the survival of the virus; bird flu epidemiological investigation showed that the incidence of bird flu or seasonal epidemic more pronounced, that avian flu can occur throughout the year, but occurred at a lower temperature, ultraviolet weak winter months, rarely occur in high temperature, ultraviolet strong summer for half a year. According to laboratory studies and epidemiological findings of an initial inferred that the impact of bird flu or avian flu or pandemic should be the dominant weather factor is temperature, followed by ultraviolet light.

Bird flu occurred in a certain temperature range

From the 2004 Asia and Europe in 2005 the incidence of avian flu, pandemic have time, from north to south, and then spread from the south, against popular features, they are at variance with the laws of migratory birds migrate more or less uniform, so many at home and abroad experts agreed that the migratory birds is a large-scale occurrence of avian flu, pandemic main spreaders of the virus, and the reason why the migration of migratory birds because they can adapt to a narrow temperature range, usually occurs in spring and autumn, so that the bird flu occurred in the initial appropriate temperature range is about 10-22 ℃, and even more wider. Avian influenza virus under certain conditions, can survive a longer period of time, under natural conditions, exist in the oral cavity and faeces of the bird flu virus due to the protection of organic matter is highly resistant, especially in the cool and humid conditions can be moderate survive for a long time, the virus in dry dust can survive two weeks, at 4 ℃ to save a few weeks, in the frozen poultry meat and bone marrow can survive 10 months. Thus speculated that the entire winter months are the period of bird flu can occur, migratory birds are concentrated south than the north of the probability of the occurrence of avian flu large.

Severe hypothermia, or cooling can reduce the receptor's ability to resist and is conducive to the incidence and prevalence of avian influenza

Severe hypothermia, or cooling can make receptor (birds, poultry, etc.) to reduce the resistance, while the corresponding number of rain during the cool weather, less sunlight, the corresponding weak UV intensity, while the avian flu virus hi hypothermia, or cooling in the low-temperature period, may lead to the occurrence of avian flu and pandemic. So, keep warm during winter to do a good job will be to prevent bird flu, the incidence and prevalence of one of the important measures. (Source: "meteorological knowledge" magazine Author: Ye Dian show)