There are antibiotics in vaccines that are used during the vaccine manufacture process which include neomycin, polymyxin B, streptomycin and gentamicin.
The antibiotics are added to vaccines to prevent the growth of germs during production and storage of the vaccine.
There is considerable debate lately over the risks of exposing children to antibiotics too early in life.
One recent study in particular found that multiple antibiotic use in early childhood may lead to weight gain, increased bone growth, and altered gut bacteria.
The MMR vaccine contains neomycin sulfate as well as hydrolyzed gelatin, sorbitol. Neomycin is an antibiotic that is known to cause both local and systemic allergic reactions. Immediate allergic reactions to the MMR vaccine, including dyspnea and hypotension, have been documented in egg-allergic individuals.
Hypersensitivity to the additives found in the MMR vaccine, especially neomycin, may be a factor in documented reactions in individuals without egg allergy according to this study.