Subject(s)

Gnathostoma/isolation & purification , Gnathostoma/ultrastructure , Neck , Skin Diseases, Parasitic/diagnosis , Skin Diseases, Parasitic/parasitology , Spirurida Infections/diagnosis , Spirurida Infections/parasitology , Adult , Animals , Diagnosis, Differential , Female , Humans , Male , Mexico , Skin Diseases, Parasitic/pathology , Spirurida Infections/pathology