Epidemiological and environmental aspects of visceral leishmaniasis in children under 15 years of age between 2007 and 2012 in the City of Araguaína, State of Tocantins, Brazil

Oliveira, Iara Brito Bucar; Batista, Hebert Lima; Pelúzio, Joênes Mucci; Pfrimer, Irmtraut Araci Hoffmann; Rodrigues, Flávia Melo; Filho, José Rodrigues do Carmo

doi:10.1590/0037-8682-0099-2014

Cited by 14 publications

(17 citation statements)

References 12 publications

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“…Assim, nos clusters de taxa de incidência alta, ocorrem temperatura noturna alta e temperatura diurna baixa. Ao que parece, não seriam nem temperaturas muito elevadas e nem tão baixas, associadas à ocorrência da LV neste estado 26 , pois assim como se cita a relação da temperatura com a reprodução do parasito, esta também influencia a atividade vetorial. A L. longipalpis apresenta tendência a ser mais ativa à noite, em temperatura de 30ºC 18 , que coincide com as baixas temperaturas diurnas identificadas neste estudo.…”

Section: Evi: íNdice De Vegetação Melhorado (Enhanced Vegetation Index)unclassified

“…A L. longipalpis apresenta tendência a ser mais ativa à noite, em temperatura de 30ºC 18 , que coincide com as baixas temperaturas diurnas identificadas neste estudo. Os flebotomíneos são vulneráveis a mudanças bruscas de temperatura e, geralmente, preferem regiões nas quais ocorre baixa variação entre as temperaturas mínimas e máximas, visto que sua sobrevivência pode ser reduzida se o clima ficar muito quente e seco 16,27 e, dessa maneira, temperaturas altas diminuem também os casos de LV humana 26 . Também foi observado que temperaturas mais baixas aumentam a longevidade e quantidade do flebotomíneo 28,29 , o que pode aumentar a incidência de LV.…”

Section: Evi: íNdice De Vegetação Melhorado (Enhanced Vegetation Index)unclassified

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Leishmaniose visceral e sua relação com fatores climáticos e ambientais no Estado do Tocantins, Brasil, 2007 a 2014

et al. 2019

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Resumo: A leishmaniose visceral (LV) pode ser influenciada por fatores climáticos e ambientais. Tocantins é o estado com mais incidência no Brasil, contribuindo para o aumento dos casos na macrorregião Norte. Este estudo tem objetivo de identificar a correlação entre a taxa de incidência de LV e fatores climáticos e ambientais, nos municípios do Estado do Tocantins de 2007 a 2014. As correlações entre a taxa de incidência bruta de LV e as variáveis elevação, precipitação, Índice de Vegetação Melhorado (EVI - Enhanced Vegetation Index) e temperatura foram testadas por meio dos índices de Moran Global e Local, identificando também clusters de incidência de LV. A análise de variância para tendência linear foi testada entre as médias das variáveis em cada categoria da taxa. Os resultados apontam aumento nas taxas de incidência, na medida em que aumentam os valores de precipitação anual, umidade, EVI e temperatura noturna; e uma relação inversa para a elevação e temperatura diurna. Os clusters identificados evidenciam que variáveis climáticas e ambientais se relacionam à incidência de LV, devendo haver outros estudos que ajustem os fatores associados aos sujeitos, a fim de dimensionar o quanto o ambiente ou a influência do homem nele impacta na doença.

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Section: Evi: íNdice De Vegetação Melhorado (Enhanced Vegetation Index)unclassified

Leishmaniose visceral e sua relação com fatores climáticos e ambientais no Estado do Tocantins, Brasil, 2007 a 2014

et al. 2019

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“…It is also known that VL mainly affects children, especially those younger than 10 years, as they are more exposed to the disease carrier in their home environment and also suffer from nutritional deficits 9,10 . However, both a decreasing trend in the number of VL cases in children and an increasing trend in adults has been seen in recent years; this is one of the factors contributing to the association of the disease with HIV, which still mostly affects young adults 9 .…”

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Visceral leishmaniasis and leishmaniasis-HIV coinfection: comparative study

Coutinho

Santos

Ribeiro

et al. 2017

Rev. Soc. Bras. Med. Trop.

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Introduction: This study aimed to draw clinical and epidemiological comparisons between visceral leishmaniasis (VL) and VL associated with human immunodeficiency virus (HIV) infection. Method: Retrospective study. Results: Of 473 cases of VL, 5.5% were coinfected with HIV. The highest proportion of cases of both VL and VL/HIV were found among men. A higher proportion of VL cases was seen in children aged 0-10 years, whereas coinfection was more common in those aged 18-50 years. Conclusions: VL/HIV coinfected patients presented slightly differently to and had a higher mortality rate than those with VL only.

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“…Certain sand fly species have been able to occupy these modified habitats, which could favor the circulation of Leishmania species in domestic environments. High rates of Leishmania infection in dogs and children in other cities in Tocantins are evidence of this process ( Bigeli et al 2012 , Teles et al 2012 , Oliveira et al 2014 ). Between 2011 and 2015, 1,473 new cases of human visceral leishmaniasis (VL) and 2,685 new cases of American cutaneous leishmaniasis (ACL) were confirmed in Tocantins.…”

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The role of gallery forests in maintaining Phlebotominae populations: potential Leishmania spp. vectors in the Brazilian savanna

Machado

Minuzzi-Souza

Ferreira

et al. 2017

Mem. Inst. Oswaldo Cruz

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BACKGROUND Knowledge on synanthropic phlebotomines and their natural infection by Leishmania is necessary for the identification of potential areas for leishmaniasis occurrence.OBJECTIVE To analyse the occurrence of Phlebotominae in gallery forests and household units (HUs) in the city of Palmas and to determine the rate of natural infection by trypanosomatids.METHODS Gallery forests and adjacent household areas were sampled on July (dry season) and November (rainy season) in 2014. The total sampling effort was 960 HP light traps and eight Shannon traps. Trypanosomatids were detected in Phlebotominae females through the amplification of the SSU rDNA region, and the positive samples were used in ITS1-PCR. Trypanosomatid species were identified using sequencing.FINDINGS A total of 1,527 sand flies representing 30 species were captured in which 949 (28 spp.) and 578 (22 spp.) were registered in July and November, respectively. In July, more specimens were captured in the gallery forests than in the HUs, and Nyssomyia whitmani was particularly frequent. In November, most of the specimens were found in the HUs, and again, Ny. whitmani was the predominant species. Lutzomyia longipalpis was commonly found in domestic areas, while Bichromomyia flaviscutellata was most frequent in gallery forests. Molecular analysis of 154 pools of females (752 specimens) identified Leishmania amazonensis, L. infantum, and Crithidia fasciculata in Ny. whitmani, as well as L. amazonensis in Lu. longipalpis, Trypanosoma sp. and L. amazonensis in Pintomyia christenseni, and L. amazonensis in both Psathyromyia hermanlenti and Evandromyia walkeri.MAIN CONCLUSIONS These results show the importance of gallery forests in maintaining Phlebotominae populations in the dry month, as well as their frequent occurrence in household units in the rainy month. This is the first study to identify Leishmania, Trypanosoma, and Crithidia species in Phlebotominae collected in Palmas, Tocantins, Brazil.

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Epidemiological and environmental aspects of visceral leishmaniasis in children under 15 years of age between 2007 and 2012 in the City of Araguaína, State of Tocantins, Brazil

Cited by 14 publications

References 12 publications

Leishmaniose visceral e sua relação com fatores climáticos e ambientais no Estado do Tocantins, Brasil, 2007 a 2014

Leishmaniose visceral e sua relação com fatores climáticos e ambientais no Estado do Tocantins, Brasil, 2007 a 2014

Visceral leishmaniasis and leishmaniasis-HIV coinfection: comparative study

The role of gallery forests in maintaining Phlebotominae populations: potential Leishmania spp. vectors in the Brazilian savanna

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