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n CME : Your SA Journal of CPD - New developments in the field of allergy and asthma : main article
Asthma has increased in nearly every part of the world studied, even in populations where the gene pool has not altered much in recent years.
The interplay between the genes and environment is an intriguing one. Migration studies have shown that asthma prevalence and bronchial hyperreactivity increase as a Western lifestyle is adopted. This has not only been shown in Africa, but also in other parts of the world, e.g. China (Hong Kong), South America and the Middle East.
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