The viruses that cause influenza change rapidly, making different strains coexist on the planet at any given time. Influenza vaccines are developed each year to protect people from the three strains expected to be most prevalent.
ALL THE VIRUSES IN THE VACCINE ARE KILLED, SO IT IS NOT POSSIBLE TO GET THE FLU FROM THE VACCINE. MOST PEOPLE HAVE NO SIDE EFFECTS FROM THE INFLUENZA VACCINE. SORENESS AT THE INJECTION SITE AND/OR MINOR ACHES AND LOW GRADE FEVER MAY BE PRESENT FOR SEVERAL DAYS.
Since the immunity provided by the vaccine wanes after several months, it is given at the beginning of the "flu season"--usually late October or early November in the U.S. People traveling to other countries should be aware that influenza occurs throughout the year in tropical countries and that the "flu season" for temperate countries in the Southern Hemisphere is April to September.
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