Avid Fan wrote:


What vaccine have you had that protects you for life? I am sure that
if you were exposed to say Polio you will fair better than someone who
never was vaccinated.

Why are you sure of that? No vaccine has ever had a double blind w
placebo study done on it so there is no proof that any of them work.


Polio vaccine blamed for outbreaks in Nigeria
http://www.msnbc.msn.com/id/32418446...tious_diseases

Polio is spreading in Nigeria and health officials say in some cases
it's caused by the vaccine used to fight the paralyzing disease.

In July, the World Health Organization issued a warning that this
particular virus might extend beyond Africa. So far, 124 Nigerian
children have been paralyzed this year — about twice those afflicted in
2008.

Nigeria and most other poor nations use an oral polio vaccine because
it's cheaper, easier, and protects entire communities. But it's made
from a live polio virus which carries a small risk of causing polio. In
even rarer instances, the virus in the vaccine can mutate into a
deadlier version that ignites new outbreaks.

A virologist with the U.S. Centers for Disease Control and Prevention
says genetic analysis proves such mutated viruses have caused at least
seven separate outbreaks in Nigeria.