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The flu virus changes every year. However, scientists gather information about virus mutations, or changes, before the flu-virus season begins.

This lets them predict what each year’s flu virus might look like. Based on that, a vaccine is made that we hope will be accurate enough to help people fight off major cases of the flu..

2007-02-27 04:30:57 · answer #1 · answered by Anonymous · 0 0

They don't! That's why they take every year the latest flu virus and produce a vaccine, but this certain vaccine protects only from theviruses of flu that have already been discovered.
Of course this vaccine protects ur health in a matter of 50% (I think)
and prevents you from getting easily sick from a flu virus

2007-02-27 12:39:45 · answer #2 · answered by Cle@r Sky 07 3 · 0 0

Major strains of flu viruses tend to originate in China and east Asia.

The vaccine companies collect samples from Asian flu victims and analyze them and determine how severe the symptoms are, how contagious they are, how they are spread, etc. When they find a flu strain that appears to be particularly strong and has the potential to spread to many people, they develop vaccines for those strains.

2007-02-27 12:34:48 · answer #3 · answered by chimpus_incompetus 4 · 0 0

Flu vaccines are generally for a single, common strain. That is a flu vaccine is not a vaccine against all flu strains, only the most common one in the area.

2007-02-27 15:08:06 · answer #4 · answered by Tim 4 · 0 0

I believe that they make a guess as to which strains of flu are going to spread the fastest, and breed vaccines for those varieties.

Of course, if everyone is vaccinated against certain strains of the flu, then those strains won't spread; everyone will get a different type of flu instead.

2007-02-27 13:48:19 · answer #5 · answered by Randy G 7 · 0 0

What they do is literally wait until the last minute to make them. This way, they can target the most recent and most common viruses at the time and have basically an updated version to treat people with.

2007-02-27 12:29:41 · answer #6 · answered by Think. 3 · 0 0

Therein lies the problem. Flu viruses keep changing, so scientists have to keep changing the formulas.

2007-02-27 12:30:39 · answer #7 · answered by kj 7 · 0 0

Wow, that's a good question...

2007-02-27 12:32:37 · answer #8 · answered by Nina Lee 7 · 0 0

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