Viruses: the enraged genes ...

Viruses a hundred times it is less in the sizes, than a bacterium, they are constantly transformed, their small genetic luggage changes within several months, and this changeable nature we allow them to overcome specific barriers. Thus, the viruses living with animals adapting for them, now with ease can be transferred to the person. It has occurred to a pork flu.

Its gene is a new structure in which the virus amazing pigs in the North America is admixed, and a virus amazing the Euroasian pigs. Viruses of an atypical pneumonia and a bird flu also are transferred from pigs to the person. As is known, scientists developed methods of transplantation of organs from pigs to the person, but now this practice have refused, taking into consideration danger of transfer of viruses.

It is possible to carry to number of new viruses: HIV/AIDS, a virus of fever which has carried away hundreds of lives in the African countries, SARS - the syndrome of the atypical pneumonia which for the first time shown in China and has extended to Vietnam, Hong Kong. Last is considered the most dangerous virus infection for the person, extends mosquitoes, and its symptoms - a heat, delicacy and vomiting. In 1993 in the USA epidemic leads to pulmonary disease at hit in a human body of products of vital activity of mice took place. This epidemic has repeated in 1998-1999, and then once again, in Argentina, in 2003. By a virus of a hepatitis With are infected more than 200 million persons worldwide, in Italy it infects 3 % of the population. All the yellow fever also is strong, but for struggle against it already there is a vaccine, it is told in article.

From the historical point of view the most interesting is the case with a smallpox. In 1796 Edward Dzhenner has received a vaccine against a smallpox, and in 1980 CART declared that is finished a smallpox. Now only a quantity of viruses of a smallpox is stored in special laboratories.

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