300 million people worldwide were affected by asthma leading to approximately 250,000 deaths per year in 2009. It is estimated that asthma has a 7-10% prevalence worldwide. In the United States specifically data from several national surveys in the United States reveal the age-adjusted prevalence of asthma increased from 7.3 to 8.2% during the years 2001-2009. The exact cause of asthma isn’t known. Researchers think some genetic and environmental factors interact to cause asthma, most often early in life. The following infographic gives an insight into asthma epidemiology and etiology in a colorful way.

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