>> “My guess this is being done on the advice of lawyers.” <<
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More likely on the advice of their friendly local pharmaceutical salesman.
Drugs and vaccines are where the money is, pure and simple.
The death culture has a part in this too, since they know how drugs and vaccines accelerate aging. ZPG has always loved drugs and vaccines.
Their malpractice insurance policy companies may be demanding it. ( in other words, Lawyers!)
If a doctor accepts unvaccinated children into his practice, the child who is sick with a preventable communicable disease can ( and likely will) infect other children and adults in the waiting room. Not everyone who is vaccinated responds with antibodies and even though vaccinated is completely vulnerable to the disease. Also, some children and adults have medical conditions that prevent them from being vaccinated.
Personally....I think this is good medical practice, for the safety of the others in the waiting room.