[2] The symptoms of Löffler's syndrome include those of a parasitic infection such as abdominal pain and cramping, skin rashes and fatigue.

Upon examination of symptoms, a doctor will likely request a chest x-ray looking for migratory pulmonary infiltrate, and blood testing, to confirm a diagnosis.

Symptoms tend to be brief, but can range from mild to severe and include: fever, vomiting, increased respirations or difficulty breathing, cough, wheeze, and rash.

[7] While it is still a mystery why the prevalence is higher in Indians, the warm damp environment is a perfect place for the parasites to grow and thrive.

[3] Then in 1932 Wilhelm Löffler[8] drew attention to the disease in cases of eosinophilic pneumonia caused by the parasites Ascaris lumbricoides,[9] Strongyloides stercoralis and the hookworms Ancylostoma duodenale and Necator americanus.

A test was then performed on the pigs' fecal matter and surrounding soil; it contained the parasite that had caused the boy's ailment.

When the doctors finally took an echocardiograph of the child they discovered that the "patient's admission blood count showed leukocytosis with an abnormally elevated level of peripheral eosinophils.