Eosinophilia in returning travellers and migrants from the tropics: UK recommendations for investigation of and initial management.

Eosinophilia is a common finding in returning travellers and migrants, and in this group it often indicates an underlying helminth infection. Infections are frequently either asymptomatic or associated with non-specific symptoms, but some can cause severe disease. Here the BIS guidelines group reviews common and serious infectious causes of eosinophilia, and outlines a scheme for investigating returning travellers and migrants. All returning travellers and migrants with eosinophilia should be investigated with concentrated stool microscopy and Strongyloides serology, in addition to tests specific to the region they have visited. Eosinophilia is also a feature of significant non-infective conditions