If you don't vaccinate, those diseases will make a comeback; we live in a connected world. One of our next door neighbor's kidS had pertussis. That was supposedly an eradicated disease. It is life threatening.
My great grand aunt contracted malaria, at the shore in CT during the first decade of the 20th century.
Those “wetlands” leftists are so determined to save are breeding grounds for all sorts of diseases.
I read somewhere that vaccines for typhoid and diphtheria have only been available since the 1940’s, pertussis somewhat later.
The problem being seen with msny of these diseases is that drug and vaccine resistant strains are being seen, much like the tuberculosis in South America and other countries that has been brought here by both legal and illegal travelers. It appears that vaccines need to be re-engineered to prevent these new strains-otherwise, there is no reason to assume they convey immunity to these diseases.