I would have to say during recommended ages. As you know, there tend to be shots that little kids have to get at certain ages, and I think that go for ages al the way up to 18? Not quite sure. But when children reach certain ages I think that they become more vulnerable to certain viruses. I hope this helps!!
(Btw, this was I reminder that I have to go get my shots soon )':)
From my point of view, it is not obligatory for him to transmit the disease to him genetically, but all options are important for preserving the body except for the slimming pills. I have always worried about them .. but it is only my opinion