Effects of El Niño-Southern Oscillation on human visceral leishmaniasis in the Brazilian State of Mato Grosso do Sul

Neto, Antonio Brandão da Silva; Oliveira, Everton Falcão de; Encina, César Cláudio Cáceres; Figueiredo, Helen Rezende de; Filho, Antônio Conceição Paranhos; Oliveira, Alessandra Gutierrez de

doi:10.1590/0074-02760190298

Cited by 15 publications

(12 citation statements)

References 22 publications

(35 reference statements)

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“…ENSO indices were correlated with the incidences of diverse infectious disease in the past illustrating how ENSO influence transmission mechanisms of various infectious tropical diseases by modulating the local weather. That includes arthropod-borne parasitic infections malaria and leishmaniasis [33,34], mosquito-borne viral infections like dengue [17], robovirus diseases like hantavirus infections [35]; hand, foot, and mouth disease, a viral disease transmitted by feco-oral route as well as respiratory route [36]; and feco-orally transmitted bacterial infection cholera [18]. IOD was described to modulate the incidence of dengue [17]; chikungunya, an arboviral disease [37]; and cholera [18].…”

Section: Comparison Of Our Results With That Of Similar Past Studies and Discussionmentioning

confidence: 99%

The correlation between three teleconnections and leptospirosis incidence in the Kandy District, Sri Lanka, 2004–2019

et al. 2021

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Background Leptospirosis is a bacterial zoonosis. Leptospirosis incidence (LI) in Sri Lanka is high. Infected animals excrete leptospires into the environment via their urine. Survival of leptospires in the environment until they enter into a person and several other factors that influence leptospirosis transmission are dependent upon local weather. Past studies show that rainfall and other weather parameters are correlated with the LI in the Kandy district, Sri Lanka. El Niño Southern Oscillation (ENSO), ENSO Modoki, and the Indian Ocean Dipole (IOD) are teleconnections known to be modulating rainfall in Sri Lanka. There is a severe dearth of published studies on the correlations between indices of these teleconnections and LI. Methods We acquired the counts of leptospirosis cases notified and midyear estimated population data of the Kandy district from 2004 to 2019, respectively, from weekly epidemiology reports of the Ministry of Health and Department of Census and Statistics of Sri Lanka. We estimated weekly and monthly LI of Kandy. We obtained weekly and monthly teleconnection indices data for the same period from the National Oceanic and Atmospheric Administration (NOAA) of the USA and Japan Agency for Marine-Earth Science and Technology (JAMSTEC). We performed wavelet time series analysis to determine correlations with lag periods between teleconnection indices and LI time series. Then, we did time-lagged detrended cross-correlation analysis (DCCA) to verify wavelet analysis results and to find the magnitudes of the correlations detected. Results Wavelet analysis displayed indices of ENSO, IOD, and ENSO Modoki were correlated with the LI of Kandy with 1.9–11.5-month lags. Indices of ENSO showed two correlation patterns with Kandy LI. Time-lagged DCCA results show all indices of the three teleconnections studied were significantly correlated with the LI of Kandy with 2–5-month lag periods. Conclusions Results of the two analysis methods generally agree indicating that ENSO and IOD modulate LI in Kandy by modulating local rainfall and probably other weather parameters. We recommend further studies about the ENSO Modoki and LI correlation in Sri Lanka. Monitoring for extreme teleconnection events and enhancing preventive measures during lag periods can blunt LI peaks that may follow.

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Section: Comparison Of Our Results With That Of Similar Past Studies and Discussionmentioning

confidence: 99%

The correlation between three teleconnections and leptospirosis incidence in the Kandy District, Sri Lanka, 2004–2019

et al. 2021

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“…We inferred that the marked decrease in the number of cases could be related to the El Niño-Southern Oscillation phenomenon and hurricane activity in the Atlantic Ocean during 2012. 67 These meteorological events trigger changes in rainfall, humidity, and continental temperature patterns, 68 and, when rainfall increases above average, there is less organic matter available for the development of sandflies, [69][70][71] leading to a reduction in leishmaniasis transmission rates. 72 This negative impact on the occurrence of VL has been documented in the Andean region 73 and Venezuela.…”

Section: Discussionmentioning

confidence: 99%

“…72 This negative impact on the occurrence of VL has been documented in the Andean region 73 and Venezuela. 74 However, da Silva Neto et al 68 showed that, in 2012, VL had an increase in incidence (12.37 cases/100,000 inhabitants) in the state of Mato Grosso do Sulen, an area in southern Brazil with particular geographic Incidence is per 100,000 inhabitants. The map was constructed using QGIS software.…”

Section: Discussionmentioning

confidence: 99%

Spatial and Temporal Variability of Visceral Leishmaniasis in Colombia, 2007 to 2018

Castillo-Castañeda

Herrera

Ayala

et al. 2021

The American Journal of Tropical Medicine and Hygiene

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Abstract.Visceral leishmaniasis (VL) is a neglected tropical disease associated with poverty and is endemic in 56 countries worldwide. Brazil, Venezuela, and Colombia are the most affected countries in South America. In Colombia, the National Public Health Surveillance System (SIVIGILA) consolidates epidemiological information and monitors all VL cases nationwide. However, to date, no studies have investigated the occurrence of VL in Colombia using metadata analysis. We studied the demographic data, the spatial and temporal distribution of VL cases, and the association with vector distribution of Leishmania species in Colombia from 2007 to 2018. We found 306 VL cases reported to SIVIGILA for this period, with a coverage of 25.5 cases/year, and a mortality of 2.28% (seven deaths). The highest number of confirmed cases (N = 52) occurred in 2007; the lowest (N = 9) occurred in 2012. The cases were reported mainly in children (< 7 years) affiliated with the subsidized health regimen. Regarding the geographic distribution, the cases were reported by 42 municipalities distributed in 10 departments. The occurrence of VL cases toward the northeast of Colombia, and the distribution of vectors, such as Lutzomyia longipalpis and Lu. evansi, may be changing the panorama of VL in the country. We conclude that VL, mainly in recent years, shows a temporal and spatial variability associated with the occurrence of cases in new settings. Our findings increase our understanding and knowledge of this disease, and suggest the need to monitor and prioritize areas with changes in geographic expansion to improve prevention and control actions in the country.

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“…Se ha demostrado que los vectores de leishmaniasis son sensibles al cambio climático, se ven fuertemente afectados por lluvias, precipitaciones, temperatura ambiental, humedad atmosférica, a fenómenos El Niño y La Niña, etc. Comprender el rol de los factores ambientales y bioclimáticos en la distribución del vector y la ocurrencia de casos de leishmaniasis proveerá una guía para los responsables en salud pública en la creación e implementación de políticas más efectivas para su control y prevención 20,[105][106] .…”

Section: Controlunclassified

Leishmaniasis: conceptos actuales y revisión de literatura

Marín-Sánchez

2021

UCV-SCIENTIA BIOMÉDICA

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El presente artículo se elaboró en base a una revisión documentada sobre las Leishmaniasis, grupo de enfermedades causadas por diferentes especies de protozoarios intracelulares del género Leishmania transmitidos por insecto infectados de los géneros Phlebotomus y Lutzomyia; son consideradas enfermedades reemergentes, descuidadas u olvidadas, endémicas en casi 100 países, asociadas a pobreza, malnutrición, migraciones, malas condiciones de vivienda, deficiencias de saneamiento, falta de acceso a los servicios médicos, elevados costos y toxicidad de los medicamentos, debilidad del sistema inmunitario, cambio climático, etc.; se estima que cada año existen 1,2 millones de casos anuales (con 20,000 a 30,000 defunciones) y 350 millones de personas están en riesgo de adquirir la infección. Se describe la variedad de formas clínicas de leishmaniasis con énfasis en las formas visceral, cutánea, mucocutánea y difusa, cuyo conocimiento es importante para establecer un diagnóstico correcto que considere la epidemiología, el cuadro clínico sugestivo y los exámenes auxiliares de laboratorio. Para su tratamiento, los antimoniales pentavalentes como estibogluconato de sodio (Pentostan®) y antimoniato de meglumine (Glucantime®) son las drogas de primera línea, a pesar de su toxicidad y aparición de resistencia; como segunda línea se tiene anfotericina B, miltefosina, pentamidina, aminosidina, ketaconazol, itraconazol, etc., que no son suficientes y conllevan a la búsqueda de nuevas alternativas especialmente de origen vegetal. La vigilancia, control y prevención de las leishmaniasis merece un abordaje integrado que incluye huésped, parásito y vector, acorde con los escenarios de cada país y localidad, utilizando todas las herramientas y tecnología disponibles. A pesar de todo lo avanzado, la lucha para reducir la morbimortalidad por leishmaniasis continúa, siendo un desafío que debemos afrontar.

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Effects of El Niño-Southern Oscillation on human visceral leishmaniasis in the Brazilian State of Mato Grosso do Sul

Cited by 15 publications

References 22 publications

The correlation between three teleconnections and leptospirosis incidence in the Kandy District, Sri Lanka, 2004–2019

The correlation between three teleconnections and leptospirosis incidence in the Kandy District, Sri Lanka, 2004–2019

Spatial and Temporal Variability of Visceral Leishmaniasis in Colombia, 2007 to 2018

Leishmaniasis: conceptos actuales y revisión de literatura

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