Chickenpox Vaccine
Chickenpox vaccine
All the currently available commercial chickenpox vaccines contain weakened live virus strains of Oka. Numerous variations of this strain tested and registered in Japan, South Korea, the United States and several European countries. The optimal age for vaccination should be between 12-24 months. In the United States these vaccine is given twice at intervals of 4-8 weeks, vaccination also is recommended for adolescents 13 years and older. In most other countries are limited to a single inoculation. This difference in the pattern of use of vaccines is due to their various doses.
In response to the vaccination of about 95% of children develop antibodies and 70-90% will be protected from infection, at least for 7-10 years after vaccination. According to Japanese researchers (Japan – the first country in which the vaccine was registered), the immunity lasts for 10-20 years. It is safe to say that the circulating virus contributes “booster” grafted, increasing the duration of immunity.
Apart from the purely prophylactic indications, the chickenpox vaccine can be used for emergency prevention of infection – if the vaccine is made not later than the third day after exposure to a source, not less than 90% of cases it is possible to prevent infection.
A combined chickenpox vaccine and measles-mumps-rubella (MMR-V) is under development. The aim of the development of this vaccine is the rapid achievement of vaccination coverage against varicella before immunization coverage against the other three infections. First results of such a vaccination would be very encouraging. After vaccination to the children they do not get sick, or suffer from chickenpox without complications.
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Posted by Kranthi on 8th June, 2010
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