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Influenza

The H1N1 flu was the predominant influenza strain in the United States this year, but it packed a lot less punch than in 2009 when it caused a worldwide pandemic, health officials report.
The survival rate of mice infected with lethal amounts of H1N1 virus increased after a molecule was blocked, according to research published in Immunity.
Oseltamivir and zanamivir reduce the time to symptomatic improvement in influenza by about half a day, but evidence to support claims of reduced admissions to hospital or complications of influenza is lacking, according to two systematic reviews of regulatory information published online April 10 in BMJ.
The antiviral drug Tamiflu (oseltamivir) reduced the risk of death by 25 percent among adults hospitalized during the 2009 H1N1 swine flu pandemic, according to a review published online March 19 in The Lancet Respiratory Medicine. In addition, antiviral treatment within 48 hours of developing flu symptoms halved the risk of death compared with starting treatment later or receiving no treatment.
The incidence of Haemophilus influenzae disease is increased during pregnancy, and infection correlates with poor pregnancy outcomes, according to a study published in the March 19 issue of the Journal of the American Medical Association.
For individuals infected with influenza, most cases are asymptomatic, and a minority of those with confirmed disease have medically attended illness, according to a study published online March 17 in The Lancet Respiratory Medicine.
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