This year's flu vaccine INCLUDES 2009 H1N1 and comes in a higher dose version called Fluzone HD for seniors.
All the 2010 vaccines (Fluzone, FluMist, etc) contain the 2009 H1N1 strain plus two additional "seasonal" strains.
This year flu vaccine is recommended for people 6 months and older.
Seasonal flu causes more complications in the elderly and those with certain chronic conditions...H1N1 causes more complications in children, young adults, and pregnant women.
We expect enough vaccine for everyone who wants it.
Some flu vaccines are delayed a few weeks for new labeling that the prefilled syringe tip caps MIGHT contain latex. If you are allergic to latex, consider using a multidose vial vaccine instead.
Most people will need just one dose of flu vaccine.
Kids age 8 and under who are getting flu vaccine for the first time...or did not get H1N1 vaccine last year should get 2 doses.
Fluzone HD for seniors. This high-dose vaccine has 4 times as much antigen as the standard adult vaccine to help boost immunity.
It can increase antibody titers. But that doesn't necessarily mean it will be more effective for preventing flu.
Seniors shouldn't automatically use Fluzone HD . It can cause more local reactions and "flu-like" symptoms. It also costs twice as much...but it's covered by Medicare part B for seniors.
Consider Fluzone HD if you are over 65 and are at higher risk for flu complications.
For kids under 8, don't use Afluria vaccine The formulation used in the southern hemisphere this year caused seizures and high fevers in young children.
Barry