feralorca2 said:granitebadger25
My child was vaccinated normally at the hospital and later on, but they have never had chickenpox—or rather, there is no scar. Does that mean something is wrong😕?
A situation where a vaccine consistently fails to leave a scar is rare, but it does happen. Under our laws, the BCG shot is repeated at age two (which has likely already occurred), then again in second grade, and if that fails, in seventh grade... after that, there's nothing more, though I think non-reactors in the military get vaccinated again (but I'm not sure if they still practice that since the law doesn't mandate it anymore).
There is no accepted explanation as to why some children don't react with a scar, nor is it certain whether that automatically means the vaccination failed its purpose.
Furthermore, one should understand that the BCG vaccine isn't lifelong protection against tuberculosis; instead, it provides highly effective protection against malignant forms of TB (such as tubercular meningitis or septicemia) during early childhood—specifically the first three to five years when the risk is highest. By the time kids reach puberty or adolescence, they are significantly less vulnerable...
I don't think you should worry if you live in standard living conditions and there are no known cases of tuberculosis within your immediate circle, like your family... I don't know how old your child is, but I assume they have already passed that most critical window.
Fortunately, tuberculosis isn't transmitted as easily as the flu. An infection requires prolonged and close contact, usually within a family or between partners living together. Infections among students have only been recorded in countries that do not perform BCG vaccinations (like the United Kingdom) and even then, it occurs between students, never (as far as I am aware) from teacher to student, because teachers generally aren't as closely involved with children as peers are.