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More Flu Bugs Show Resistance To Anti-Virals

April 4, 2007

Bird Flu • FDA Gains Insight to Bird Flu Virus • New Flu Bug Proves Resistant to Antiviral Drugs • Report: Nation Not Ready For Flu Pandemic • Antiviral Overuse Could Aid Deadly Flu • 1918 Flu Virus Offers Clues to Prevent Pandemics • Scientists Report Progress Toward Bird Flu 'Cure' • Bird Flu Not the Only Animal Disease Threat • Bird Flu Vaccine Trials 'Encouraging' • FDA Frets about Flu Drugs' Side Effects • World Not Ready For Bird Flu • Researchers: Bird Flu Pandemic Inevitable • Bird Flu Scare in Virginia • FDA Issues Flu Vaccine Guidelines • FDA Approves First Bird Flu Vaccine • More Flu Bugs Show Resistance To Anti-Virals • Seasonal Flu Shot Might Offer Some Bird Flu Protection • Experts Concerned about Tamiflu Overuse • Study Finds Much Bird Flu Planning is Misplaced • U.S. Orders More Bird Flu Vaccine • Scientists Identify Genetic Changes That Could Lead to Bird Flu Pandemic • Drug Interaction Can Render Tamiflu Ineffective • New Bird Flu Variant Renews Pandemic Concerns • Researchers Find New Weapon Against Flu Virus • Researchers Test Spreadability of Bird Flu Viruses to Humans • GlaxoSmithKline Claims Bird Flu Breaththrough • Global Corporations Struggle to Plan For Pandemic • Flu Pandemic Is "Inevitable," EU Experts Warn • Bird Flu Virus May Have Mutated In Indonesian Cases • Indonesian Nurse May Have Bird Flu • Study Warns of "Chaos" and "Panic" If Bird Flu Strikes • Investigators Find No Evidence Bird Flu Virus Has Mutated • Scientists Fear Bird Flu Virus May Have Mutated • Airlines Queasy About Quarantining Bird Flu Victims • More ...

Health officials are seeing stronger, tougher flu bugs this year. A new Japanese study now suggests that Influenza B is becoming resistant to two antiviral vaccines commonly used to protect against flu, zanamivir, marketed as Relenza, and oseltamivir, best known as Tamiflu.

Officials say the report is disturbing since health officials are counting on stockpiles of Tamiflu to control the early stages of any pandemic that might occur.

The study, conducted by Dr Shuji Hatakeyama, of the University of Tokyo, and scientists from various academic and government institutes, appears in the Journal of the American Medical Association (JAMA).

There has been previously documented evidence that some type A viruses have can develop a resistance to Tamiflu, but this is the first study to find a similar situation with type B viruses. Influenza B viruses are associated with annual outbreaks of illness and increased death rates worldwide, according to background information in the article.

The researchers collected influenza B isolates from 74 children before and after oseltamivir therapy and from 348 untreated patients with influenza (including 66 adults). Four hundred twenty-two viruses from untreated patients and 74 samples from patients after oseltamivir therapy were analyzed.

The researchers identified a variant with reduced drug sensitivity in one (1.4 percent) of the 74 children who had received oseltamivir, and seven (1.7 percent) of the 422 influenza B viruses isolated from untreated patients were found to have reduced sensitivity to zanamivir, oseltamivir, or both.

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