Hello and welcome!
Originally Posted by Sumayyahs Mommy
1) How thoroughly are vaccinations tested on humans prior to being recommended?
After understanding how Genetically Modified Organisms are handled/tested prior to being introduced into our food supply, I am curious how it is done for vaccines.
I think testing is for the most part done with the best information that researchers have on hand, but one of my concerns is that there may be things that they don't know about and therefore can't screen for.
An example from the past: SV40 (simian virus #40; named because it was the 40th one discovered in polio vaccines).
SV40 was in the injected form of polio vaccines that were manufactured between 1955 and 1961.
It probably came from the kidney cells of infected monkeys, which were used to "grow" the polio virus.
Unfortunately at the time it was nearly impossible to detect small quantities of the virus.
Regular detection became possible around 1983 with the advent of PCR technology. PCR stands for polymerase chain reaction, and it is a biochemical technology used in molecular biology.
Although many deny that there's a connection between cancer and SV40 in vaccines, I don't feel comfortable being injecting with something that can have (at the present) unknown undetectable (with current technology) particles.
I also think it's extremely telling how one of the discoverers of SV40, Dr. Berenice Eddy, was demoted and lost her laboratory for exposing what she found to the public. I fear that even now, scientists who discover problems in vaccines face the possibility of the same kind of blackballing.
You can read more about this in an old Atlantic Monthly article: