On Earth at any moment could erupt pandemic

On Earth at any moment could erupt pandemicAt any point on the globe can explode into huge influenza pandemic like 1918 or in 1968, which killed tens of millions of people, said the representative of the world health organization (who) Margaret Chan. "History shows that to stop the pandemic impossible," she said. Recently scientists are especially concerned about the mutation of avian influenza and the possibility that, in the end, it mutates and begins to spread from person to person. If this happens, the virus has already killed 55 people in Asia, will threaten the lives of millions of people around the world. "Bird flu has already killed hundreds of thousands of poultry, is a menacing warning to humanity from nature," said Dr. Chan, the first serious warning after 1968. The flu virus can quickly change their genes and create new, more durable strains. To such conclusion the American scientists. Previously, scientists believed that the change in the genome of the virus from one year to the next is gradual. However, researchers at the National Institute of health in the US found that the flu "And" can simultaneously modify multiple genes, which leads to a rapid and drastic changes of the characteristics of the virus. The findings of scientists, published in the scientific journal PLOS Biology suggests that the strains that appear in each subsequent season, can be radically different from its predecessors. This seriously complicates vaccine development and treatment of patients. Each year, experts are trying to predict which strain of flu will be the greatest danger in the new season. It is on the basis of these forecasts is created the vaccine. In the study, Dr. David Lipman and his colleagues observed the behavior of the virus "And" smote the people of new York for five years - from 1999 to 2004. This virus became the progenitor of the so-called "Fujisawa" strain H3N2. Because scientists were not prepared for the emergence of such varieties of the flu, the vaccine did not take into account all its features. In the winter of 2003-2004, the virus caused a serious flu outbreak. All researchers studied 156 strains. It was found that the strains differed from each other. In some of the strains in a short period of time was changed to four genes. "Consequently, the genetic diversity of the virus is not so limited, as argued before," said one of the researchers. Experts add that scientists need to learn more about the changes in influenza viruses, because mutations can occur unexpectedly. BBCrussian.com, Radio "Liberty"".

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