Norwegian H1N1 Mutation Not New

A "potentially significant" mutation of the 2009 H1N1 virus has been detected in 3 severe cases (including 2 fatalities) of pandemic flu in Norway; however, the mutated virus is nothing new, according to the World Health Organization. The spontaneous mutation—which does not confer resistance to the antiviral drugs oseltamivir (Tamiflu; Roche) or zanamivir (Relenza; GSK)—was detected as early as April and has been found sporadically in both severe and mild flu cases in other countries,* reports WHO.

The 2009 H1N1 mutation has not been described or labeled explicitly in news reports. But according to a quoted Norwegian health official, the mutation "makes it possible for the virus to fasten itself or infect deeper into the bronchioles, and therefore provide for a more serious progress of the disease." This description suggests that the mutation lies in the gene encoding the viral binding protein, hemagglutinin.

WHO maintains that the current pandemic flu vaccine does produce immunity against the mutated virus.

* Namely Brazil, China, Japan, the Ukraine, and the United States.

Depiction of H1N1 virus from Wikipedia.