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1 dose of H1N1 vaccine may provide sufficient protection for infants and children
Date:12/21/2009

CHICAGO -- One dose of vaccine may be effective to protect infants and children and reduce transmission of the H1N1 virus, according to a study in JAMA, published online today because of its public health implications. The study will appear in the January 6 print edition of the journal.

Initial reports of 2009 influenza A(H1N1) infection in many countries have largely involved children, especially those attending school. Reports have also indicated high hospitalization rates of children younger than 5 years of age in the current pandemic, according to background information provided by the authors. "The Advisory Committee on Immunization Practices also currently recommends that infants and children aged 9 years or younger receive two doses of H1N1 influenza vaccine at least 21 days apart, based on existing experience with seasonal trivalent influenza vaccines in this age group."

Terry Nolan, M.B.B.S., Ph.D., from the University of Melbourne, Australia and colleagues assessed the effectiveness and safety of two doses of a 2009 influenza A(H1N1) vaccine in 370 healthy infants and children ages six-months to less than 9 years living in Australia. The children were randomized into groups that received a two-injection regimen 21 days apart in doses of either 15-micrograms or 30-micrograms of the vaccine.

"Following the first dose of vaccine, antibody titers of 1:40 or greater were observed in 161 of 174 infants and children in the 15-microgram group (92.5 percent) and in 168 of 172 infants and children in the 30 microgram group (97.7 percent)," the authors report. "All participants demonstrated antibody titers of 1:40 or greater after the second vaccine dose," [which means that every child achieved an antibody level considered high enough to protect against the H1N1 virus]. The researchers note that the majority of adverse reactions to the vaccine were mild to moderate in severity. The immune responses to the vaccine were strong
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Contact: Terry Nolan, M.B.B.S., Ph.D.
t.nolan@unimelb.edu.au
JAMA and Archives Journals
Source:Eurekalert

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