Acquiring Mumps naturally while males are still young is also protective against the likelihood of becoming infertile due to acquiring it when older. It also provides life-long immunity to acquire it naturally when young.
Or is it Measles? lol It’s one of the two.
I can certainly see vaccinating kids before puberty if they don’t have antibodies to mumps. Getting it past puberty is problematic.
If I knew of a mumps party I could take my daughters to I’d be there. Ovarian cancer is really scary. Mumps at their age is a couple days of low fever, swollen glands and bitchy kids. Ovarian cancer kills way more than mumps ever did.