The ingredients in vaxxines do alter the gut. When the gut is not healthy, the immune system is affected, as well as brain function. Almost every autistic spectrum child I came into contact with also had gut issues. Andy Wakefield was one of the first to make this connection. GMO foods are also a huge contributor. Not only does the GMO plant have altered gene sequences, some which the human body does not recognize or know what how to process, but these crops are heavy contaminated with glyphosate which destroys normal gut flora and is a neurotoxin. Modern altered wheat has a much higher gluten content than previous wheat. Gluten is a protein. So increased gluten can lead to sensitivities. Allergies are different. They need an exposure primer to set the ball in motion. Many vaxxines can act as this primer mechanism that can lead to full blown allergies.