Word: h1n1
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...time the pathogen colloquially known as swine flu had bounced to almost every corner of the world in April, health officials were girding for a once-in-a-lifetime pandemic with the potential to kill millions. H1N1 ripped through the U.S., prompting President Obama to declare a national emergency. But while the virus has been formidable--some 50 million Americans have been sickened since April, according to Centers for Disease Control and Prevention estimates, and about 10,000 have died--it hasn't been the seismic event some feared. At least...
...latest study of an Australian H1N1 vaccine, a shot that is also distributed in the U.S., shows that a single dose containing the same amount of viral protein as two doses combined, can produce enough flu-fighting antibodies in nearly 93% of youngsters immunized. "The single-dose response is substantially better than responses to seasonal flu vaccines of past years," says Terry Nolan of the University of Melbourne, the lead author of the study. That's good news for parents and public health officials, particularly in light of the fact that about half of U.S. children never get their second...
...antigen each. In both cases, the second dose was given 21 days after the first. The researchers found that 21 days after receiving only one shot, 92.5% of children in the 15-mcg-dose group and 98% of those receiving the higher dose had generated sufficient antibodies against H1N1...
Such data will be available only after the flu season ends next spring, at which point researchers can study hospital records of children who were treated for H1N1 infection. Only then can they compare those who received both doses of the vaccine to those who missed their second shot, and see if one or the other group was more likely to come down with...
...healthy, with normal immune systems. But those who are most vulnerable to influenza are children with underlying conditions such as asthma or diabetes, who may need the added boost from a second dose to protect them from complications of the flu. He notes also that previous studies of other H1N1 vaccines showed slightly weaker antibody responses in children after a single dose than the Australian shot, which suggests one dose may not be enough to effectively combat influenza in youngsters...