Some vaccines do contain very small amounts of antibiotics “to prevent the growth of germs (bacteria) during production and storage of the vaccine.”
These antibiotics can include neomycin, gentamycin, polymyxin B, or streptomycin.
Although allergies to antibiotics are not rare, the presence of antibiotics in some antibiotics has never been found to cause severe allergic reactions in kids who get vaccinated.
And in many cases, the antibiotics are actually removed from the final vaccine or only remains in residual amounts.
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