RESUMO
This study investigated a model to assess the role of climate fluctuations on dengue (DENV) dynamics from 2010 to 2019 in four Brazilian municipalities. The proposed transmission model was based on a preexisting SEI-SIR model, but also incorporates the vector vertical transmission and the vector's egg compartment, thus allowing rainfall to be introduced to modulate egg-hatching. Temperature and rainfall satellite data throughout the decade were used as climatic model inputs. A sensitivity analysis was performed to understand the role of each parameter. The model-simulated scenario was compared to the observed dengue incidence and the findings indicate that the model was able to capture the observed seasonal dengue incidence pattern with good accuracy until 2016, although higher deviations were observed from 2016 to 2019. The results further demonstrate that vertical transmission fluctuations can affect attack transmission rates and patterns, suggesting the need to investigate the contribution of vertical transmission to dengue transmission dynamics in future assessments. The improved understanding of the relationship between different environment variables and dengue transmission achieved by the proposed model can contribute to public health policies regarding mosquito-borne diseases.
Assuntos
Aedes , Vírus da Dengue , Dengue , Animais , Dengue/epidemiologia , Mosquitos Vetores , Tempo (Meteorologia)RESUMO
Environmental modifications caused by low tunnels made of perforated transparent polyethylene were determineted in an area alocated at the Federal University of Santa Maria, RS. The perforation densities were 100, 200, 300 and 400 perforations per square meter, corresponding respectively to 0.78% (T1), 1.57% CT2), 2.35% (T3) and 3.14% (T4) of area perforated. The results indicated that perforation density did not significantly affected solar energy availability. As perforation density increased there was a decrease on the average diurnal air temperature which demonstrated the viability of ventilating low tunnels with perforated plastic. It was also observed that inside the perforated tunnels the averages values for soil, air minimun and diurnal temperatures and air relative humidity were higher than on the external environment.
Determinou-se as modificações ambientais causadas por túneis baixos de polietileno transparente perfurado instalados no Departamento de Fitotecnia da Universidade Federal de Santa Maria, RS. As densidades de perfuração estudadas foram 100, 200, 300 e 400 perfurações por m² correspondendo, respectivamente, a uma área perfurada de 0,78% CT1), 1,57% (T2), 2,35% (T3) e 3,14% (T4). Os resultados evidenciam que a densidade de perfuração não modificou significativamente a disponibilidade de energia solar. À medida que aumentou-se a densidade de perfuração ocorreu um decréscimo no valor médio diurno da temperatura do ar, aspecto que demonstra a viabilidade de ventilar o túnel baixo através da perfuração do plástico. Também observou-se que nos túneis perfurados, os valores médios da temperatura do solo, mínima e média diurna do ar e umidade relativa do ar foram maiores que no ambiente externo.
RESUMO
Environmental modifications caused by low tunnels made of perforated transparent polyethylene were determineted in an area alocated at the Federal University of Santa Maria, RS. The perforation densities were 100, 200, 300 and 400 perforations per square meter, corresponding respectively to 0.78% (T1), 1.57% CT2), 2.35% (T3) and 3.14% (T4) of area perforated. The results indicated that perforation density did not significantly affected solar energy availability. As perforation density increased there was a decrease on the average diurnal air temperature which demonstrated the viability of ventilating low tunnels with perforated plastic. It was also observed that inside the perforated tunnels the averages values for soil, air minimun and diurnal temperatures and air relative humidity were higher than on the external environment.
Determinou-se as modificações ambientais causadas por túneis baixos de polietileno transparente perfurado instalados no Departamento de Fitotecnia da Universidade Federal de Santa Maria, RS. As densidades de perfuração estudadas foram 100, 200, 300 e 400 perfurações por m² correspondendo, respectivamente, a uma área perfurada de 0,78% CT1), 1,57% (T2), 2,35% (T3) e 3,14% (T4). Os resultados evidenciam que a densidade de perfuração não modificou significativamente a disponibilidade de energia solar. À medida que aumentou-se a densidade de perfuração ocorreu um decréscimo no valor médio diurno da temperatura do ar, aspecto que demonstra a viabilidade de ventilar o túnel baixo através da perfuração do plástico. Também observou-se que nos túneis perfurados, os valores médios da temperatura do solo, mínima e média diurna do ar e umidade relativa do ar foram maiores que no ambiente externo.