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Because vaccines are known to be effective, it is unethical to test a new vaccine against a placebo
Demonstrating that people not exposed to HepB don't acquire it, is not particularly interesting.
There really is so much evidence that vaccines don't work and even that they are very very dangerous. by design!
Vaccines don't work at all!!and they haven't 'removed' diseases at all!it is all propaganda.and vaccines are very very dangerous.