As how about combining vaccines in single visits. There has never been testing on combining different manufactured shots at the same time to mix in the blood. Some ingredients open the blood brain barrier which allows live viruses and other harmful ingredients access to the brain. Combining Tylenol with vaccines has even shown to cause Cytokines storms and yet pediatricians tell parents to dose their kids with Tylenol before shot appointment. The science hasn’t been done because no one wants to know the answers.