Toxocara species exposure, symptoms of asthma, and fractional exhaled nitric oxide in the US population

Asthma is a major cause of morbidity in the United States.1 Toxocariasis is caused by exposure to the eggs of the nematodes Toxocara canis and Toxocara cati.2,3 Clinic-based studies have reported the association of Toxocara species with asthma. A study using data from the Third National Health and Nutrition Examination Survey (NHANES III) of 1988 to 1994 examined the association between Toxocara species infection and lung function in the United States.4 Infection was negatively associated with forced expiratory volume in 1 second.

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