Detection of Lutzomyia 12S ribosomal DNA and of Leishmania kinetoplast DNA by polymerase chain reaction (PCR) of pools of field-collected Lutzomyia sand flies. A, Agarose gel electrophoresis of 12S ribosomal DNA PCR products in a representative subset of pools. Lane 1, 100-basepair (bp) ladder; lanes 2–8, DNA from Lutzomyia pools; lane 9, positive control of male Lutzomyia spp.; lane 10, blank. B, Agarose gel electrophoresis of kinetoplast DNA PCR products. Lane 1, 100-bp ladder; lanes 2–8, positive Lutzomyia pools; lane 9, positive control of L. (V.) braziliensis strain MHOM/BR/84/LTB300; lane 10, negative control of male Lutzomyia spp.; lane 11, blank.