Sensitivity to the different strains of influenza depends, including, from what year he was born. This was stated by a group of American specialists from the University of Arizona in Tucson, as well as California and Arizona universities. According to scientists, this is due to the fact that different variations of the virus are in two or more successive sub-groups.
In the study, scientists were mainly interested in two strains of flu, H5N1 and H7N9 — the most dangerous versions of “bird flu”. Experts drew attention to the age of the people exposed to one or the other of these viruses, and examined what the flu epidemic had on their childhood.
As it turned out, the people who were born before 1968, were more susceptible to the H7N9 strain, and those who were younger — to H5N1. According to researchers, this is due to the fact that a few decades ago were more common variations of the flu, “related” H7N9, and immunity of people who were kids then, was formed so that the strain they were less terrible. Young people, on the contrary, under the influence of new strains of the immune system formed so that their bodies were less vulnerable to H5N1. In all likelihood, this means that the human immune system is the best “remember” those threats it has faced, when man was still a child.
Experts suggest that these data will more accurately predict how it will develop one or another flu epidemic, depending on which strain it provoked. Also, experts expect that on the basis of their insights in future it will be possible to create a more effective flu vaccines.
His research scientists published in the journal Science.
About the flu virus scientists have known since 1930. It is divided into three genera A, B and C. Further division is carried out according to the subtypes of surface proteins hemagglutinin (HA) and neuraminidase (NA).