FDA approves six vaccines for the 2008-09 influenza season.

A wonderful example of how to confuse people. .Food and Drug Administration (FDA) has approved six influenza vaccines intended to target strains that "are likely to cause flu in the United States" during the 2008-09 season. Agency officials explained that every year, the "vaccines are modified to reflect the virus strains most likely to be circulating," and the "closer the match between the circulating strains and the strains in the vaccines, the better the protection." Last year's flu vaccine didn't match two of three main types of flu that sickened people. Still, the "vaccination remains the cornerstone of preventing influenza. Comment: The problem is that the flu virus mutates so rapidly, and dispersion is so simple (with air travel) that it is very difficult to predict what strain will be dominant in the US each fall. It still takes so long to identify and prepare a new targeted vaccine that we will have to wait for improved technology before a real annual match tor currently circulating strains can be developed..