Eosinophilia Treatment and Management

Diagnostic Approach

The Journal of Infection recommends evaluating for common causes of eosinophilia, including parasitic infections, especially in those with travel history 1, 2
Stool microscopy and serology for specific helminth infections should be performed based on travel history 2, 3
For patients with gastrointestinal symptoms, consider endoscopy with multiple biopsies to evaluate for eosinophilic esophagitis 2
Patients with persistent eosinophilia ≥ 1.5 × 10⁹/L for more than 3 months without evidence of organ damage should be referred to a hematologist 1

For asymptomatic eosinophilia in patients aged > 24 months, the Journal of Infection recommends albendazole 400 mg single dose plus ivermectin 200 μg/kg single dose 1
For strongyloidiasis, ivermectin 200 μg/kg daily for 2 days is recommended 3
For schistosomiasis, praziquantel 40 mg/kg in two divided doses for 1 day is recommended 3
For onchocerciasis, diethylcarbamazine is recommended, but specialist advice should be sought due to potential adverse reactions 4

Proton pump inhibitor therapy twice daily for 8-12 weeks is recommended 3
Topical steroids can induce histological and clinical remission 3
A two-food elimination diet (milk +/- wheat or egg) for 8-12 weeks with dietitian support is recommended 2, 3

For eosinophilic meningitis, corticosteroids plus albendazole are recommended 5
For neuroschistosomiasis, praziquantel 40 mg/kg twice daily for 5 days plus dexamethasone 4 mg four times daily is recommended 5
For toxocariasis with neurological involvement, corticosteroids plus albendazole are recommended 5
Any patient presenting with evidence of end-organ damage needs urgent medical assessment and consideration of emergency treatment 1

Follow-up eosinophil counts should be obtained after treatment to assess response 2
For eosinophilic esophagitis, histological remission is defined as <15 eosinophils per 0.3 mm² in tissue biopsies 2
For persistent eosinophilia despite treatment, consider referral to a hematologist for further investigation 1

Persistent eosinophilia of any degree can cause significant end-organ damage, particularly affecting the heart, lungs, and central nervous system 1
Many people with helminth infection do not have eosinophilia, so testing for eosinophilia alone is not an adequate screening strategy for helminth infection 1
In some cases of persistent eosinophilia, no cause can be identified - termed idiopathic hypereosinophilia 1
For patients with refractory eosinophilia and/or significant concomitant atopic disease, consider joint management by appropriate specialists 2