Your question is more relevant and I think that religiosity will have a huge impact in the child immuniztion by increasing the level of hesitancy among the population.
I share with you a link where you can come across the situation in DR Congo.
Maybe your answer would depend on who you asked, but in my work in the autism field for twenty years I have continually run into parents with an older child or sibling who had an adverse response to a particular vaccine or combination of vaccines and become concerned that the same thing would happen to a younger sibling. As far as I can tell, parents with these concerns do not seem to come from any particular religious persuasion or family structure except that their concerns are for younger siblings who share similar genetics. I could be wrong about this, but I don't think most new parents think of such risks unless they already know someone close to them with a similar story. That could extend past the nuclear family. I hope you can include these sorts of questions in your study design to see what you will find.
truly i agree with the fact that type of family and religiosity effect the immunization pattern of children . there are several examples about the same. In many religions immunization is not permitted and type of family like joint family, one may skip the date and time of immunization, same could be with single parent family , due to excessive work the parent might skip the immunization schedule
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