Influenza is a serious disease, over treatment and prevention of whom are fighting many doctors and scientists. If treatment is prescribed individually, to prevent, as a rule, apply special vaccines against specific strains that cause disease. Such a vaccine, scientists believe, good saves from a particular virus, but when the body is faced with a similar modified form of the infection a chance to defend themselves become less than those not vaccinated person, writes The Gazette, referring to the experience at the pigs.
Dr. Amy Vincent has developed a vaccine that consisted of the whole of inactive virus, whereas classical vaccine consists of virus particles. Thus, piglets were vaccinated against influenza type H1N2, and then infected with the H1N1 virus. After some time, the animals underwent complicated infection with the development of various pathologies.
A similar case was observed in Canada, where vaccinated before for the most part people were getting the H1N1 flu. Scientists explain this phenomenon by the fact that the set of antibodies are not able to slow down the penetration of the virus. Eventually a complex of the antibody-virus, which only helps in passing through the gates of infection.
Surface proteins of viruses (H1, H2, H3) differ in structure from each other. This is the reason that a vaccine against one strain does not work against the other. It should say what each type is, for example, H1, has many subspecies also differ from each other. The virus is constantly changing, and the universal vaccine to date not been developed that forces scientists to update the composition of the flu.