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I believe there is evidence that spacing it out reduces compliance. The reason the schedule is clustered is because most people won't bring their kid to the doctor every few weeks, and most don't want vaccines still going at 3.
I delayed my son's HepB vaccine because, well both his parents are vaccinated and there is probably a less than 0.000001% chance of him getting HepB. There are a few that are newer that probably protect very few (not high incidence in this country, like rotavirus which killed like 25 kids/year) but is a potential source of morbidity. But people underestimate the benefit of herd immunity and the fact that re-introducing these things by not vaccinating could cause big outbreaks.
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