Immune Deficiency

I am not sure if it is the same thing but I saw a doctor speaking of TV about immune deficiency he said that children are being kept too clean when young they are not building up the immunity to germs and viruses as my mother used to say let your kids get dirty let them play in the gutter...we kids were never sick and we were always playing in the gutter, this doctor also said it was becoing such a problem they are thinking of injecting children with germs or something like that so they will build an immunity while they are young...I hope someone can identify with your problem...