[Respective frequency of Hypoderma species (Insecta Diptera Oestroidea) as the cause of human cases of hypodermiasis in France].

The authors, taking into consideration, on the one hand, numbers of larvae issued from human cases and respectively identified as Hypoderma bovis and H. lineatum (at least when the specific determination cannot be put in doubt), on the other hand, the comparative intensity of serological reactions obtained between sera of more than one hundred cases by them diagnosed, and antigens respectively prepared from H. bovis and H. lineatum first instar larvae, come to the conclusion that, in France at least, the most numerous cases have as agent the first of these two species. They discuss different hypothesis giving possible explanation of the observed differences of frequency. On account of this higher frequency of cases by H. bovis, and of the complete lacking, sometimes, of crossed reactions with H. lineatum, they think that, for all serological researchs of human hypodermatosis, antigens corresponding to the two species have to be used, when, nearly always, alone is used H. lineatum antigen, for reason of easiness in collecting larvae for its preparing.