The CDC page on the bundling of vaccines which goes quite a bit into the why of it - https://www.cdc.gov/vaccines/parents/why-vaccinate/combination-vaccines.htm

The CDC page on the bundling of vaccines which goes quite a bit into the why of it - https://www.cdc.gov/vaccines/parents/why-vaccinate/combination-vaccines.html https://www.cdc.gov/vaccines/parents/why-vaccinate/combinati...