Immunity of Diseases Help

Question

I'm trying to find more correlational diseases. For example, having Sickle Cell Anemia gives an immunity to Malaria. Having Tuberculosis gives an immunity to Cystic Fibrosis (or the other way around I don't remember.) I need to find more like this, so send any if you can please.

Answer 1

Some infections on gum can cause heart infection (endocarditis)

Infections in middle ear can spread inside if not treated, and can cause meningitis and even death.

Infections on eye also can spread inside and infect the brain.