Fecha: 
07/08/2018
Linea de Investigacion: 

Abstract

Aedes aegypti L. (Diptera: Culicidae) is a mosquito broadly found in tropical and temperate areas of the world. It is the main vector of dengue, chikungunya, zika and yellow fever (urban cycle), among other viruses. Aedes aegypti immatures develop in water holding containers, and frequently use artificial containers in urban settings as larval habitat. Ovitraps are artificial oviposition sites, a tool developed for mosquito population surveillance and to assess effectiveness of control measures. The preference for different oviposition substrate materials was assessed in the field, in two localities of Salta province, northern Argentina, where dengue outbreaks are frequent. The proportion of positive traps did not differ between oviposition substrates. However, higher numbers of eggs were laid in cotton fabric and velour paper, which were better than wooden paddle and blotting paper if the aim was to maximize the numbers of eggs collected. The results also evidenced that substrate preference for oviposition did not differ between geographic regions.

Fecha: 
03/08/2018
Linea de Investigacion: 

Abstract

The sand fly fauna in Hipólito Yrigoyen, Argentina, a locality where cutaneous leishmaniasis cases occur, was surveyed with zones of higher abundance of sand flies correlated to vegetation cover estimated through normalized difference vegetation index (NDVI). Sand flies were collected with 10 CDC traps during six nights, from December 2009 to January 2010. A map was built of expected sand flies abundance in which levels of NDVI were categorized. In total, 1,392 Phlebotominae (Diptera: Psychodidae) specimens were collected, comprised of the following species: Nyssomyia neivai (Pinto 1926), Migonemyia migonei (França 1920), species of the cortelezzii complex (Brèthes 1923), Evandromyia sallesi (Galvão & Coutinho 1940), and Psathyromyia shannoni (Dyar 1929). Positive correlations were found between the abundance of sand flies and the NDVI (P < 0.05) for buffer areas of <150 m radii from the trap location points, i.e., the sand fly abundance was greater where vegetation cover and density were greater. In this context, plant cover should be taken into account to prioritize surveillance and control areas within the program of sand flies control in northern Argentina.

Autor/es: 
Fecha: 
10/07/2018
Enfermedades Tropicales 2018
Fecha: 
01/06/2016
Linea de Investigacion: 
Abstract
Resumen: Los eventos de salud y sus determinantes varían en el espacio y el tiempo. Poder conocer los patrones espacio-temporales, representa un objetivo primordial de la epidemiología como herramienta de la salud pública. Este conocimiento es el sustrato mediante el cual se pueden generar programas o intervenciones preventivas y de control. En la provincia de Salta, el sistema sanitario ha avanzado considerablemente en cuanto a la informatización y manejo en red de la información recabada por la Atención Primaria de la Salud en áreas operativas, sub áreas y/o sectores sanitarios. El presente trabajo plantea y fundamenta la necesidad de consensuar con diferentes sectores (principalmente el INDEC) unidades básicas de recolección de datos que permitan el "cruce" de información tanto para la investigación por parte del personal de Salud, como de instituciones científicas bajo convenio con el Ministerio de Salud. En este sentido se plantea la generación de una IDE en salud pública de la provincia de Salta considerando dos usos principales: a) uso interno del sistema de salud e instituciones científicas y b) servicios online públicos como potenciales estrategias de prevención de enfermedades. Se abordan dos ejemplo, uno referido a Aedes aegypti, dengue, chikungunya y zika y otro referido a la leishmaniasis.
 
 
Fecha: 
05/10/2017
Linea de Investigacion: 

Abstract

Leishmania (Viannia) braziliensis is the species most frequently implicated with cutaneous and mucosal leishmaniasis in the Americas; its diagnosis is based on the identification of amastigotes in lesions, which is limited by low parasite burden. Leishmanin Skin Test (LST) is a support tool for diagnosis, based on delayed type hypersensitivity responses to Leishmania antigens injected intradermally, used in endemic areas as a complement to diagnosis. A retrospective analysis of individuals evaluated for their first episode of tegumentary leishmaniasis at a reference center in Argentina during the period 2006–2015 was performed, with the goal of assessing its usefulness as a support tool in the diagnosis of leishmaniasis. Demographic, clinical and diagnostic work-up were analyzed in individuals with clinically compatible lesions, lesion`s smear and LST. A total of 733 cases that met the case definition were included in the analysis; 678 (93%) localized cutaneous cases, 50 (7%) with mucosal involvement and 5 (<1%) disseminated. Diagnostic confirmation was reached in 474 (65%) cases through positive smears from skin or mucosal lesions, with only 6 cases among this group having negative LST. Among smear negative cases, 190 were negative also by LST, but in 69 instances LST was positive. Across age groups, similar ratios of sensitivity between smear and LST were calculated. Lesions older than 21 days-old were found to correlate with positive results both for smear and LST significantly more than younger lesions. These findings support the clinical use of LST as a diagnostic complement for American Cutaneous Leishmaniasis across all age groups even in endemic areas. In this analysis, the correlation with smear was high. Standardization of this technique and further research into its most adequate preparation and utilization protocols across different sites will help in the management of suspicious clinical cases.

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