I think this is more explaining the differnt vaccines that are given. There are different variation off the dtap vaccine. If you look at an actual schedule of vaccinations required by states to attend school the child will have taken the dtap vaccine about 6 times in their whole infancy/childhood. This list should be longer given how many times over the years the child is "required" to take each vaccine.
Some of them are repeated. Like there's a bunch of dtap/tdap vaccines, but they don't get all of them. So I'm not talking this as accurate.
I think this is more explaining the differnt vaccines that are given. There are different variation off the dtap vaccine. If you look at an actual schedule of vaccinations required by states to attend school the child will have taken the dtap vaccine about 6 times in their whole infancy/childhood. This list should be longer given how many times over the years the child is "required" to take each vaccine.