Tamiflu saves lives of severely ill flu patients

Roche AG’s antiviral drug Tamiflu helped prevent deaths from seasonal flu in severely ill patients who had chronic underlying health problems, Chinese researchers said on Sunday.

A study of 760 older, severely ill patients in Hong Kong found that Roche and Gilead Sciences Inc’s drug Tamiflu cut the rate of death by 37 percent.

More than 60 percent of patients in the study had underlying chronic illnesses, and 78 percent had been hospitalized with complications from seasonal flu.

The study, done by researchers at the Chinese University of Hong Kong and presented at the Interscience Conference on Antimicrobial Agents and Chemotherapy in San Francisco, suggests the drug can help save the lives of seriously ill flu patients, Dr David Reddy, who leads Roche’s pandemic flu task force, said in a telephone briefing.

Known generically as oseltamivir, Tamiflu is one of two antiviral drugs that work well against H1N1 swine flu.

The study took place in two hospitals in Hong Kong between 2007 and 2008. About half the patients in the study got Tamiflu and half got no treatment. Death rates were about the same at both hospitals.

“In this study, Tamiflu improved the survival rate by reducing the rate of death by 37 percent in this high-risk group of patients with severe seasonal flu compared to no treatment,” Reddy said.

The U.S. Centers for Disease Control and Prevention is recommending that the very old and people with chronic medical conditions should be treated with antiviral drugs — either Tamiflu or GlaxoSmithKline and Biota’s Relenza — when they have flu-like symptoms.

Health officials caution against using either drug in otherwise healthy people who have moderate or mild flu symptoms, however, because of the fear of resistance. Influenza viruses very quickly change to put up a strong defense against antiviral drugs. Last year the seasonal H1N1 virus developed strong resistance to Tamiflu. Two older flu drugs, amantadine and rimantadine, now have very little effect against influenza viruses.

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Early use of antivirals key in H1N1 flu: WHO

Early use of antivirals is effective in treating H1N1 flu and health authorities must be vigilant for signs of drug resistance, the World Health Organisation said on Friday.

Drug-resistant pandemic flu viruses have appeared infrequently so far and there is no evidence they are spreading, but further cases are likely, the WHO said on its website.

Growing international experience showed the importance of the early use of oseltamivir, manufactured as Tamiflu by Roche Holding and Gilead Sciences, or zanamivir, an inhaled medicine produced as Relenza by GlaxoSmithKline in swine flu cases,” the WHO said.

“The experience of clinicians, including those who have treated severe cases of pandemic influenza, and national authorities, suggests that prompt administration of these drugs following symptom onset reduces the risk of complications and can also improve clinical outcome in patients with severe disease,” the Geneva-based U.N. agency said.

“This experience further underscores the need to protect the effectiveness of these drugs by minimizing the occurrence and impact of drug resistance,” it said.

Most people who contract pandemic influenza suffer only mild symptoms before recovery without treatment, but children, pregnant women and those with some existing health conditions are vulnerable to a more severe attack or even death.

The WHO, which declared H1N1 a global pandemic in June, says one third of the world’s population of nearly seven billion people could catch it.

The risk of resistance is higher in patients who suffer from weak immune systems and have already been treated with oseltamivir, it said.

It is also high in people who are treated with the antivirals as a prophylactic — as a precaution after exposure to someone with influenza, but nevertheless develop the disease.

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Tamiflu saves lives of severely ill flu patients

Tamiflu saves lives of severely ill flu patients

Early use of antivirals key in H1N1 flu: WHO

Early use of antivirals key in H1N1 flu: WHO