 high eosinophil blood counts caused by mutations in the eosinophil cell line of one of these three genes), 'b) Chronic eosinophilic leukemia, and c) the Idiopathic hypereosinophiic syndrome.In the latter classication, secondary hypereosinophilia/eosinophilia is not viewed as a true disorder of eosinophils.Here these two classifications are merged and expanded to include the many forms of secondary, i.e.