Abstract
Published reports of Symphoromyia biting man are reviewed from a geographical perspective. Most accounts describe the biting event but fail to document subsequent reactions to the bites. One case involving a hypersensitive allergic response to bites of Symphoromyia in western Washington is discussed. After the attack, the patient received horse fly antigen and apparently developed some degree of cross-immunity desensitization to snipe fly bites, as indicated by little or no reaction to their bites following treatment.

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