He's ignorant or superstitious... and is he saying his wife is evil or the disease itself is evil, btw?
We all know that disease comes from little gnomes or spirits living in the body and you have to bleed them out! Has he taken her to the barber lately?
Oh, that would be 18th and 19th century medicine. My bad.
It wasn't Pandora or Eve's fault either.
Disease is natural, a body isn't perfect, they can fail or become infected just like everything else.