Look up those diseases. Many of them are not that bad, especially the Measles. I know that isn't one you mentioned but as an example. I'm not sure about the ones you mentioned but I read 50 Years in the Church of Rome by Charles Chiniquy from the 1880s. He wrote about having Typhoid Fever and it wasn't that bad. Do the research. Also, with a strong immune system and nearly everyone else being needle-stuck, you should be okay. Trust in the Lord.