Why doesn't Argentina have a high incidence of MS?

Considering its location, they should at least have a moderate incidence.
Especially considering their beef intake. Looking at this map South America in general seems relatively MS-free - is it just because less is reported, or because the environment is less polluted, ore is organic?

Another anomoloy is Portugal and Spain - why is the country with the highest sunlight exposure (spain) extremely high, and yet surrounds a country that is moderate (portugal) for ms diagnosis?
I think there is more to the prevelance of MS than we're being led to beleive.
Especially considering their beef intake. Looking at this map South America in general seems relatively MS-free - is it just because less is reported, or because the environment is less polluted, ore is organic?

Another anomoloy is Portugal and Spain - why is the country with the highest sunlight exposure (spain) extremely high, and yet surrounds a country that is moderate (portugal) for ms diagnosis?
I think there is more to the prevelance of MS than we're being led to beleive.