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Egg Hatching and Survival of Immature Stages of Aedes aegypti (Diptera: Culicidae) Under Natural Temperature Conditions During the Cold Season in Buenos Aires, Argentina
In temperate regions, the seasonal dynamics of Aedes aegypti (L.) (Diptera: Culicidae) is mainly influenced by temperature. It is assumed that, during the winter season, the population remains as eggs and that the development and population growth of surviving eggs begin during the following spring. The aim of the current study was to assess egg hatching of Ae. aegypti during the winter in Buenos Aires city (Argentina), and analyze the survival of immature stages. The experiments consisted of immersing eggs and studying the development of immature stages of cohorts from June and September under natural temperature conditio...
Source: Journal of Medical Entomology - January 11, 2017 Category: Biology Authors: De Majo, M. S., Montini, P., Fischer, S. Tags: Population and Community Ecology Source Type: research

Geographical Variation of Deltamethrin Susceptibility of Triatoma infestans (Hemiptera: Reduviidae) in Argentina With Emphasis on a Resistant Focus in the Gran Chaco
Chagas disease is one of the most important parasitic infections in Latin America. The main vector of the protozoan Trypanosoma cruzi in America is Triatoma infestans, a blood-sucking triatomine bug who is widely distributed in the Gran Chaco ecoregion. Control programs in endemic countries are focused in the elimination of triatomine vectors with pyrethroid insecticides. However, chemical control has failed in the Gran Chaco over the last two decades because of several factors. Previous studies have reported the evolution of different levels of resistance to deltamethrin in Tri. infestans. Recently, very high resistance h...
Source: Journal of Medical Entomology - June 29, 2016 Category: Biology Authors: Fronza, G., Toloza, A. C., Picollo, M. I., Spillmann, C., Mougabure-Cueto, G. A. Tags: Vector Control, Pest Management, Resistance, Repellents Source Type: research

Dynamics of Exposure to Rickettsia parkeri in Cattle in the Parana River Delta, Argentina
Several cases of human rickettsiosis caused by Rickettsia parkeri were recently documented in the Paraná River delta of Argentina, where the tick vector is Amblyomma triste Koch. As cattle suffer recurrent A. triste infestations, they are at risk of becoming infected with R. parkeri. Herein we investigated the dynamics of R. parkeri and its A. triste vector in a herd of beef cattle. Cattle were followed for 18 mo and samples were analyzed for the presence of antibodies against four Rickettsia species (R. parkeri, Rickettsia bellii, Rickettsia amblyommii, and Rickettsia felis) and also for the presence of rickettsial...
Source: Journal of Medical Entomology - May 19, 2016 Category: Biology Authors: Monje, L. D., Costa, F. B., Colombo, V. C., Labruna, M. B., Antoniazzi, L. R., Gamietea, I., Nava, S., Beldomenico, P. M. Tags: Vector/Pathogen/Host Interaction, Transmission Source Type: research

Host-Feeding Sources and Infection With Trypanosoma cruzi of Triatoma infestans and Triatoma eratyrusiformis (Hemiptera: Reduviidae) From the Calchaqui Valleys in Northwestern Argentina
We assessed the prevalence of infection with Trypanosoma cruzi, parasite genotypes (discrete typing units, DTUs), and the host-feeding sources of domestic and peridomestic Triatoma infestans Klug and Triatoma eratyrusiformis Del Ponte in eight rural communities of the subandean Calchaqui valleys in northwestern Argentina. We sought to analyze their epidemiological role in the context of routine vector surveillance and control actions. Infection with T. cruzi was determined by optic microscopy or polymerase chain reaction (PCR) amplification of the hypervariable region of kinetoplast DNA minicircles. Parasite genotypes were...
Source: Journal of Medical Entomology - May 19, 2016 Category: Biology Authors: Cecere, M. C., Leporace, M., Fernandez, M. P., Zarate, J. E., Moreno, C., Gürtler, R. E., Cardinal, M. V. Tags: Vector/Pathogen/Host Interaction, Transmission Source Type: research

Cold Season Mortality Under Natural Conditions and Subsequent Hatching Response of Aedes (Stegomyia) aegypti (Diptera: Culicidae) Eggs in a Subtropical City of Argentina
In this study, we analyzed the mortality of Ae. aegypti eggs exposed to the cold season as well as their hatching patterns under laboratory conditions in the city of Resistencia, Chaco, Argentina. The mortality rate was 48.6%. No statistically significant differences were observed in the mortality of eggs exposed at different sites. Hatching response differed significantly among the successive postexposure immersions, with the highest proportion of hatched eggs during the first immersion. These results show that the mortality rate of Ae. aegypti eggs exposed to the cold season in a subtropical city of Argentina was higher ...
Source: Journal of Medical Entomology - September 11, 2015 Category: Biology Authors: Gimenez, J. O., Fischer, S., Zalazar, L., Stein, M. Tags: Population and Community Ecology Source Type: research