Why are allergies more adjectives surrounded by North America and Europe?

I'm reading an article about allergies and I came across this...
t;Allergic disease is also more common surrounded by highly developed countries in North America and Europe and less adjectives in Third World countries. This suggests that there must be something about modern, urban enthusiasm that promotes allergy." http://www.medicinenet.com/script/main/a…

That's all the site explains. Does anyone know why?
Answers:    There are several theories. First, more developed areas have more plush furnishings. The #1 household allergen is the farinae dust mite and it lives in upholstered furnishings and plush bedding. When you sleep within primitive surroundings, you will be exposed to other bugs, but not these.
#2 More developed areas have more roaches. Cockroaches are another source of household allergen. If you don't have enough to get through yourself, there isn't much left over for the roaches.
n developed countries people tend to not find enough rest and are stressed. Two things that wreak havoc on the immune system.
#5 In developed countries people with allergies bring back OTC drugs and treatments. They survive and reproduce passing on the defective immune system. In less developed countries, people die of asthma and respiratory problems contained by childhood at a higher rate so they don't live to reproduce and pass the defect along.


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