Adopted the vaccination program – a waste of money, says study
Against some pathogens pointless to vaccinate because they are constantly changing form, tell scientists in the face of Dr. Rory Bowden from Oxford University. He and his colleagues made sure that the bacteria respond to pneumococcal vaccination in the states in 2000, reports BBC.
Known that vaccines train the immune system so that it is responsive to infection. For example, the vaccine against tetanus triggers the production of antibodies that act on a dangerous toxin.
According to Bowden, today there are many, apparently, stable vaccines that affect not mutating pathogens. But, for example, the pneumococcus bacterium found in more than 90 variations. Each variation of immune looks different, so you need a separate vaccine.
The infection can lead to pneumonia or meningitis, which resulted in more than 800,000 children under five die every year. From all vaccine strains – something out of the category of fiction. But in 2000 the United States began to vaccinate vaccine that protects against the seven most common variations. This has led to a rapid decline in incidence.
By 2007 recorded 76% reduction in the rates of sepsis, pneumonia and meningitis in children under five. However, some bacteria are still able to change the skin to avoid the immune system. They did it by using the pieces of DNA left over from other dead bacteria pneumococcus.
Analysis of bacterial genes revealed five cases of skinning. So, one of the resulting strains quickly take over the country. So, existing at the time of the vaccination program does not guarantee protection.