Vaccine trials are done on healthy individuals. Let’s say they measure the safe rate of replication for a healthy child and then use that same vaccine on a child with a compromised immune system. What appears to happen at times, is that some children have such a severely compromised immune systems that it causes the virus to replicate out of control[68]. Vaccines that are manufactured this way are the rotavirus, measles-mumps-rubella (MMR), smallpox and chickenpox vaccines.
-James Morcan
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