Even though the flu season is coming to a close, federal and state health officials are analyzing a group of influenza B viruses in North Carolina that seem to not react to the antiviral drug Tamiflu as regular flu viruses have in the past.
Physicians have been informed by state health officials about the fact that the viruses apparently have experienced a genetic change that has not been observed in virus samples from other states.
The U.S. Centers for Disease Control have performed lab tests revealing that the modified viruses are less responsive to Tamiflu in the laboratory, but they are not totally resistant.
A state health department spokeswoman, Julie Henry, said that this most likely would not affect the average person, but that it is serious enough to inform physicians about this genetic change so that they can make the best treatment decisions.
Antiviral drugs remain the best treatment for those hospitalized with the flu, but doctors need to be alerted to the fact that since there has been a change in specific influenza B viruses, Tamiflu may not work as well in certain patients as it usually does.
From November to February, about 31 viruses were collected from 92 samples from North Carolina that showed the genetic change. Most of these patients had the usual flu symptoms and got better after a few days. This said, one patient did die soon after they were diagnosed with the flu, but they had extreme underlying immune conditions.
The CDC is currently testing more flue viruses from North Carolina as well as some surrounding states. The agency has also begun a telephone survey of residents in N.C. who have tested positive for influenza B.
Even though influenza B infections have been more prevalent this season, some physicians say that there is not a greater risk with them than there is with other flu strains. They want to remind people that the very best way to keep the flu from spreading is to wash your hands, cover coughs and sneezes, stay home if you are sick, and avoid those that are sick at your home.