The spermatogenic process of the common vampire bat Desmodus rotundus under a histomorphometric view

Among all bat species, Desmodus rotundus stands out as one of the most intriguing due to its exclusively haematophagous feeding habits. However, little is known about their spermatogenic cycle. This study aimed at describing the spermatogenic process of common vampire bats through testicular histomorphometric characterization of adult specimens, spermatogenic production indexes, description of stages of the seminiferous epithelium cycle and estimative of the spermatogenic process duration. Morphometrical and immunohistochemical analyzes for bromodeoxiuridine were conducted under light microscopy and ultrastructural analyzes were performed under transmission electron microscopy. Vampire bats showed higher investment in gonadal tissue (gonadosomatic index of 0.54%) and in seminiferous tubules (tubulesomatic index of 0.49%) when compared to larger mammals. They also showed a high tubular length per gram of testis (34.70 m). Approximately half of the intertubular compartment was found to be comprised by Leydig cells (51.20%), and an average of 23.77x106 of these cells was found per gram of testis. The germline cells showed 16.93% of mitotic index and 2.51% of meiotic index. The overall yield of spermatogenesis was 60% and the testicular spermatic reserve was 71.44x107 spermatozoa per gram of testis. With a total spermatogenesis duration estimated at 37.02 days, vampire bats showed a daily sperm production of 86.80x106 gametes per gram of testis. These findings demonstrate a high sperm production, which is commonly observed in species with promiscuous mating system

Leishmaniasis-Vector Surveillance and Control in Brazil: A Challenge to Control Programs

This is the first English-language book dedicated to Brazilian sand flies and their medical importance. No other country has so many species of these haematophagous insects as Brazil and their diversity has reached an astonishing level. The book contains comprehensive chapters, written by Brazilian experts on their regional distribution, their ecology and their importance as vectors of pathogens and parasites. Methods for sampling, processing and preserving phlebotomines are reviewed as are perspectives on surveillance and leishmaniasis vector control. A novel classification is presented whose aim is to help investigators identify the species that they are working with more efficiently.Fil: Maia Elkhoury, Ana Nilce S.. Pan American Health Organization; BrasilFil: Albuquerque, Rafaella. Ministry of Health. Communicable Diseases General Office; BrasilFil: Salomón, Oscar Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; Argentina. Ministerio de Salud. Instituto Nacional de Medicina Tropical; Argentin