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[Blood hypereosinophilias. III. Symptomatic hypereosinophilias: allergic, cutaneous, parasitic, infective, pulmonary and gastro- intestinal diseases].

The most frequently observed of the symptomatic hypereosinophilias are those caused by allergic, cutaneous, parasitic, infectious, pulmonary and gastroenteric conditions. Among the allergic conditions, particular attention is paid to the hypereosinophilias caused by allergic asthma, gastroenteritis and reactions to drugs. The most common skin conditions linked to hypereosinophilias such as bullous dermatites and angio-oedema are considered. Turning to the parasitic conditions, the various types of parasite that may produce hypereosinophilias by infesting the organs are examined. The aetiology of tropical eosinophilias and the pathogenetic mechanism that may trigger hypereosinophilias are discussed. It has been thought advisable to group the lung pathologies associated with hypereosinophilias under a separate heading, despite the indubitable importance of the allergic element in these events. Among gastroenteric conditions, the one considered is eosinophilic gastroenteritis whose clinical, anatomopathological and aetiopathogenic features are still not quite clear. Examples of certain forms of secondary hypereosinophilias are given in the form of four unusual personal cases of bronchial asthma, filariasis, an exceptional infestation by Hypoderma bovis and eosinophilic gastroenteritis.