TB vaccine is now a live virus vaccine
|One longstanding objection against vaccines has
been that the live viruses, once in the bloodstream, do not behave
themselves and die like good little viruses should. Instead, they reproduce
and mutate and could cause long term side effects of immune disorders etc.
A recent study pointed up another possible mutation problem - this time with the simple breeding of the weakened viruses by those who manufacture the vaccine.
The TB vaccine was possibly the first live virus vaccine - first offered in the first few years of this century.
But repeatedly breeding the weakened TB viruses since 1908 is suspected to have caused the vaccine to be somewhat unpredictable in effectiveness.
After having observed that whereas the vaccine delivered in Great Britain was 70 percent effective, the vaccine delivered in India was totally ineffective, scientists examined the genes of the cultured weakened TB viruses (originally those which caused TB in cows) and found out that the genes had mutated significantly.
Because of this and the threat of increased cases of TB, scientists working on a new TB vaccine (ETA unknown).
SOURCE: Science 1999;284:1520-1522.
Update: live weakened virus vaccines
were previously thought to deliver 6-10 years of immunity from the illness
but now, have been observed in some cases to provide less than 3 years of
immunity. In the past couple of years, the FDA has informed us that
vaccines now contain LESS mercury. Mercury even in small amounts of a
strong toxin (poison).