The virus belonging to family of toga-viruses is the reason of rubella. Transmitting the virus from the person to person is carried out with air, by means of sputum which spreads in air space at conversation or through use subjects, etc. The virus may spread through a placenta having infected a fetus directly from mother.
The virus is capable to survive only in a human body and perishes from ultraviolet rays, lowered humidity (dryness), sharp rise in temperature, and change of atmospheric pressure. However, low temperature influences the virus as the preserver, in such conditions it is capable to keep the vital activity for many years.
In being diseased person the pathological symptoms may not be observed at all, that is why the child who caught this virus constantly visiting children’s institutions it is capable to infect most of the companions before someone realizes that he is sick. Emergence of rubella flashes is fixed approximately one time per seven years, exacerbations are observed every year during the spring and summer period, but such implications don’t constitute danger to society; the undertaken prophylaxis measures allow to avoid emergence of a serious epidemiological situation.
The last very large-scale epidemic situation was recorded in the sixties last century in North America. The illness captured more than twenty million people, at that the births of children with malformations because of rubella in several thousand pregnant women were registered at that time.