U.S. Centers for Disease Control and Prevention officials Anni Shu Chatterton 2, said that clinical trials confirm that children under 9 years old need two doses of influenza A H1N1 flu injection vaccine, and the best interval of 4 weeks, in order to trigger adequate immune response.
World Health Organization and some countries, health experts have estimated that each take two doses of influenza vaccine injections to achieve the protective effect, and later clinical trial data indicate that a single injection of healthy adults and adolescents will be able to play a preventive effect. The latest U.S. clinical trials confirmed that children under 9 years of age still need two doses of vaccination.
Shu Chatterton said that because of influenza on young people and children the most serious hazards, the United States is currently distributed to the states more than 3000 million doses, about half of the 18 years of age for the vaccination. Influenza A virus is currently not on antiviral drugs Tamiflu and Relenza resistance.