Changed the strategy of vaccination for chickenpox in Canada, scientists have justified the introduction of two doses of varicella vaccine compared to one for all canadian children.
All provinces and territories of Canada have routine immunization of children one dose of the vaccine since 2007, which contributed to a significant reduction of cases of varicella. However, episodes of illness may, in some cases with severe symptoms. There is growing evidence that immunity to one dose of the vaccine may be decreased, and the child can develop the disease at an older age.
We must remember that chickenpox or people just "chicken pox" easy to move in early childhood and difficult complications in older.
The second vaccination, to extend the immunity and thus reduce the incidence of chickenpox.
In our country, vaccination against chickenpox is not yet included in the immunization schedule.