Determinant factors for malaria transmission on the coast of Oaxaca State, the main residual transmission focus in Mexico

Hernández-Ávila, Juan Eugenio; Rodrı́guez, Mario H.; Betanzos-Reyes, Ángel Francisco; Danis‐Lozano, Rogelio; Méndez-Gálvan, Jorge; Velázquez-Monroy, Oscar; Tapia-Conyer, Roberto

doi:10.1590/s0036-36342006000500007

Cited by 19 publications

(16 citation statements)

References 25 publications

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“…2 It is shown here that occupants of houses in the periphery of the communities had an increased risk of malaria infection, probably because of their proximity to An. pseudopunctipennis larval breeding sites, the main malaria vector in the or more people in the same bed, resulting in a higher risk of infection (OR 1.85, 95% CI 1.09-3.14).…”

Section: 25mentioning

confidence: 69%

“…The geographic distribution of cases confirms that malaria transmission occurs mainly in foothill localities. 2 The distribution of cases peaked in the 10 to 15 years age group, although a continuous increase of anti-P. vivax antibody prevalence with age was documented in the sero-epidemiological survey (Danis et al in preparation). This is indicative of low but persistent malaria transmission similar to that of other unstable hypoendemic areas on the continent where malaria occurs at all ages, but young and middle-age adults are at a higher risk.…”

Section: No3 Mayo-junio De 2007mentioning

confidence: 98%

“…2 These studies demonstrated substantial variability in malaria transmission among localities and that the main factors determining malaria transmission in this focus are related to climate and geographic and hydrologic conditions that favor the nearby breeding of mosquito vectors. This exceptional combination of conditions supporting mosquito vector abundance could explain the malariogenic potential and resilience to control within the focus.…”

Section: Introductionmentioning

confidence: 95%

“…Rogelio Danis-Lozano, MSc, DSc, (1) Mario Henry Rodríguez, MD, PhD, (2) Ángel F Betanzos-Reyes, MD, MSP,…”

Section: Individual Risk Factors For Plasmodium Vivax Infection In Thmentioning

confidence: 99%

“…Localities were selected following a balanced sampling strategy 3 according to a 4-level malaria transmission intensity index based on the annual malaria incidence and persistence of transmission during the previous 10 years. 2 The localities were selected based on the distribution of this index by size of the village and its distribution according to elevation: coast (0-200 masl), foothills (200-750 masl) and mountain ranges (750-1500 masl). Accordingly, 15 …”

Section: Study Areamentioning

confidence: 99%

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Individual risk factors for Plasmodium vivax infection in the residual malaria transmission focus of Oaxaca, Mexico

Danis‐Lozano¹,

Rodrı́guez²,

Betanzos-Reyes³

et al. 2007

Salud pública Méx

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Objective. To identify individual risk factors for malaria infection of inhabitants in the residual transmission focus on the Pacific coast of Oaxaca, Mexico. Materials and Methods. A population-based, matched case-control study was conducted from January 2002 to July 2003 comparing the frequency of exposure to individual risk factors in subjects presenting clinical malaria and uninfected controls. A malaria case was defined as an individual living in the study area presenting malaria symptoms and a Plasmodium vivax-positive thick blood smear; controls were individuals negative to P. vivax parasites and antibodies of the same gender and with ± five years as the case. A standardized questionnaire was used to record information about the individual risk factors associated with malaria episodes in cases and two controls for each case. Results. In a multiple conditional logistic regression model analysis of data from 119 cases and 238 controls, 18 out of 99 variables were significantly associated (p< 0.05) with increased risk of malaria, including: being born in another locality (RM 3.16, ResumenObjetivo. Identificar los factores de riesgo individuales determinantes para contraer paludismo en habitantes del foco residual de transmisión de paludismo localizado en la costa del Pacífico de Oaxaca. Material y métodos. Se realizó un estudio pareado de casos y controles, con base poblacional de enero de 2002 a julio de 2003, comparando la frecuencia de exposición a diversos factores de riesgo individuales en sujetos que presentaron un cuadro clínico de paludismo y controles no infectados. Un caso de paludismo fue definido como un individuo que vive en el área de estudio que presentó síntomas de paludismo y diagnosticado positivo a P. vivax en examen de gota gruesa de sangre, los controles fueron individuos negativos a parásitos y anticuerpos anti-P. vivax del mismo sexo y ± cinco años la edad del caso. Se usó un cuestionario estandarizado para registrar información de factores de riesgo individuales asociados a episodios de paludismo en casos y dos controles por caso. Resultados. El análisis en un modelo de regresión logística condicional múltiple, 18 de 99 variables fueron significativamente asociadas (p< 0.05) con el incremento en el riesgo de paludismo, incluyendo: nacer fuera de la localidad (RM 3.16, 95% IC 1.16-6.13); hablar sólo un idioma autóctono (RM= 2.48, 95% IC 1.19-3.77); pobre conocimiento de cómo se transmite y trata el paludismo (RM= 2.26 95% IC 1.10-4.66 P< 0.02);

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Section: 25mentioning

confidence: 69%

Section: No3 Mayo-junio De 2007mentioning

confidence: 98%

Section: Introductionmentioning

confidence: 95%

“…Rogelio Danis-Lozano, MSc, DSc, (1) Mario Henry Rodríguez, MD, PhD, (2) Ángel F Betanzos-Reyes, MD, MSP,…”

Section: Individual Risk Factors For Plasmodium Vivax Infection In Thmentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%