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Detailed explanation-1: -The lowest rates were observed in Vietnam (1.0%), Bosnia-Herzegovina (1.4%), and China (1.4%) [21]. The higher prevalence observed in more developed countries may be due to increased urbanization/westernized lifestyle, higher rates of obesity, and/or pollution.

Detailed explanation-2: -Inflammation and narrowing of the small airways in the lungs cause asthma symptoms, which can be any combination of cough, wheeze, shortness of breath and chest tightness. Asthma affected an estimated 262 million people in 2019 (1) and caused 455 000 deaths.

Detailed explanation-3: -One theory is that migrants don’t encounter the same allergens, particularly ryegrass pollen, in their home countries. When they come in contact with such pollen in Australia, their allergies are activated. there are migrants who are developing symptoms of hayfever or asthma but aren’t picking up on it.