For those of you who take the annual shot against ordinary flu, WHO has come up with its recommendations for the 2006-2007 flu season shot for the Northern Hemisphere. And in the U.S., the CDC is accepting those recommendations:
1. A/New Caledonia/20/99-like (H1N1)
2. A/Wisconsin/67/2005-like (H3N2)
3. B/Malaysia/2506/2004-like
I know that the A and B stand for the type of influenza. The place is where it was first discovered. I'm not sure what the middle number means. The final number is the year of discovery. The H stands for hemagluttin and the N for neuraminidase.
The flu shot always contains the 3 influenza strains WHO expects to be the most common during the flu season.
How do they know?
From tracking, from experience and from guesswork.
Sometimes they do guess wrong. Another strain spreads, people get exposed to it but the vaccine wasn't desired to protect them from the strain they're exposed to -- and that's often why people who have the shot still get sick.
Yet they need to desire this early, because it takes at least 6 months to test, manufacture and distribute the flu shots.
One possible positive result of the bird flu fears will be an improved and streamlined technology for creating and manufacturing vaccines. Which will also make the annual flu shot more accurate.
If you want to keep track of ordinary flu in the United States, here's your web page:
CDC weekly information on influenza in the U.S.
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