Nope. Areas with poor public health infrastructure and a casual attitude towards personal hygiene tend to have higher rates of disease and parasites.
First world countries tend to have the diseases of the rich - diabetes, atherosclerosis, obesity, etc.
Third world countries tend to have more infectious and communicable diseases - tuberculosis, cholera, intestinal parasites, etc.
When mass quantities of people move from one world to another, they tend to swap diseases.
Third worlders tend to carry more than one kind of culture across the boarders.
That’s why they stopped my ancestors at the boarder and made sure the passed a health check before they would admit them into this country.
Man, this thread became quiet. People ran out of knees, I suppose.