Distribution of dengue vectors in neighborhoods with different urbanization types of Manaus, state of Amazonas, Brazil

Ríos-Velásquez, Claudia María; Codeço, Cláudia Torres; Honório, Nildimar Alves; Sabroza, Paulo S; Moresco, Monica; Cunha, Ivana C. L.; Levino, Antônio; Toledo, Luciano Medeiros de; Luz, Sérgio Luíz Bessa

doi:10.1590/s0074-02762007005000076

Cited by 34 publications

(25 citation statements)

References 26 publications

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“…Due to the oviposition behaviour of Aedes, which is a colonizer of any kind of water-holding container, this is not a surprising finding. A similar observation has also been reported in other Brazilian cities as Salvador (Teixiera et al 2002b, Morato et al 2005, Manaus (Ríos-Velasquez et al 2007), and Rio de Janeiro (Maciel-de-Freitas et al 2007). However, surprisingly, in Recife the PI for one of the districts (Casa Forte) in site1 was negative during 2004 (Table).…”

Section: Discussionsupporting

confidence: 81%

Developing new approaches for detecting and preventing Aedes aegypti population outbreaks: basis for surveillance, alert and control system

Regis¹,

Monteiro

Melo-Santos

et al. 2008

Mem. Inst. Oswaldo Cruz

130

128

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Section: Discussionsupporting

confidence: 81%

Developing new approaches for detecting and preventing Aedes aegypti population outbreaks: basis for surveillance, alert and control system

Regis¹,

Monteiro

Melo-Santos

et al. 2008

Mem. Inst. Oswaldo Cruz

130

128

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“…Although a great reduction in egg hatching is observed after four months, it is likely that enough eggs remain viable to maintain the reproductive cycle during drier periods when less water is available in containers (Pinheiro and Tadei, 2002;Ríos-Velásquez et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

Eggs viability of Aedes aegypti Linnaeus (Diptera, Culicidae) under different environmental and storage conditions in Manaus, Amazonas, Brazil

et al. 2016

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The viability of Aedes aegypti eggs was assessed in the Amazon region. The eggs were maintained under different conditions: indoors (insectarium) and outdoors (natural environment), as well as in different storage types (plastic cup, paper envelope, plastic bag) for different days. Egg viability was measured as the mean of hatchings observed from egg-bearing sheets of filter paper immersed in water, using three sheets randomly selected from each storage type and at both sites. There were significant differences in the viability of Ae. aegypti eggs with respect to the location (F=30.40; DF=1; P<0.0001), storage type (F=17.66; DF=2; P<0.0001), and time of storage (F=49.56; DF=9; P<0.0001). The interaction between storage site versus storage type was also significant (F=15.96; DF=2; P<0.0001). A higher hatching mean was observed for the eggs kept in the insectarium than for those outdoors (32.38 versus 7.46). Hatching rates of egg batches stored for 12 to 61 days ranged between 84 and 90%. A reduction was observed between 89 and 118 days, with values of 63 and 48%, respectively. With respect to type of storage, mean egg hatching was higher for the eggs in plastic cups (44.46). It was concluded that the viability of the eggs of Ae. aegypti in the Amazon region remains high up to 4 months, after which it declines drastically, although in this study hatching occurred for up to 8 months in very low percentages.Keywords: oviposition, hatching rate, Aedes aegypti, density, Amazon. Viabilidade de ovos de Aedes aegypti (Diptera, Culicidae) em diferentes condições de armazenamento em Manaus, Amazonas, Brasil ResumoTestou-se a viabilidade dos ovos de Ae. aegypti na região amazônica armazenados em copos plásticos, envelopes de papel e sacos plásticos que foram mantidos em área interna e em área externa por dias diferentes. Verificaram-se diferenças significativas na viabilidade dos ovos considerando-se a localização (F=30,40; GL=1; P<0,0001), os tipos de armazenamento (F=17,66; GL=2; P<0,0001) e os tempos (F=49,56; GL=9; P<0,0001) e na interação localização versus tipo de armazenamento (F=15,96; GL=2; P<0,0001). A média de eclosão dos ovos armazenados no insetário foi maior: 32,38, do que a dos lotes armazenados na área externa: 7,46. As taxas de eclosão dos ovos armazenados de 12 a 61 dias ficaram entre 90% e 84% com reduções a partir de 89 e 118 dias, quando atingiu de 63% e 48%, respectivamente. Em relação aos tipos de armazenamento a média de ovos dos copos foi significativa (44,46). Conclui-se que a viabilidade dos ovos de Ae. aegypti na região amazônica é mantida em níveis elevados até 4 meses, e a partir daí ocorrem reduções drásticas, com eclosões até 8 meses em percentuais muito baixos.Palavras-chave: oviposição, taxa de eclosão, Aedes aegypti, densidade, Amazônia.

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“…In Manaus, a lower incidence of dengue was verified in the dry season, when the Ae. Aegypti mosquito was found in 84-90% of the houses, while the highest values were verified in November (transition/rainy period), with 94-98% of positive households 33 . It is known that, in Manaus, the predominant climate is the Equatorial one 20 , with the rainy season lasting from January to May and the dry season, from July to September 33 .…”

Section: Rainfallmentioning

confidence: 94%

A ocorrência da dengue e variações meteorológicas no Brasil: revisão sistemática

Viana

Ignotti

2013

Rev. bras. epidemiol.

116

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Introduction: Dengue is configures in recent decades as an important cause of morbidity and mortality in Brazil and around the world reaching the tropical and subtropical areas. Objective: To review the scientific literature on the occurrence of dengue in Brazil and its relationship with meteorological variables. Method: A systematic review of studies published in databases (SciELO, PubMed, MEDLINE, Lilacs) using descriptors related to weather variations and dengue fever in Brazil, published between 1991 to 2010. It was selected 31 articles that had the study area nationwide. Results: Most epidemiological studies use ecological design, the studies make use of entomological trapping, are common also series of studies of the disease and spatial analysis. It is evident relationship between dengue incidence with temperature and rainfall, the association is more significant from the second to fourth months of the year. Comparative studies of drought and rain show seasonal behavior of the disease. There are difficulties in establishing unique pattern of seasonality of disease incidence and weather variables for the country. Conclusion: Dengue is strongly related to meteorological variables. The seasonal variation in temperature and rainfall influences the dynamics of the vector and the incidence of the disease throughout the country, regardless of the climate category. The number of cases of classic dengue and of dengue hemorrhagic fever has been increasing on an annual basis. It is estimated that 550 thousand hospitalizations with 20 thousand deaths occur per year among a total of approximately 2.5 billion exposed people 4,5 , and an average of 80 million new cases are reported every year 2 . KeywordsAs a reemerging endemic or pandemic disease, it occurs practically in all the tropical and subtropical regions of the planet 1 . The countries located in these regions are more susceptible due to diverse conditioning factors, such as: global changes, climate changes, weather variability, land use, water storage and irrigation, human population growth and urbanization 6 . Such factors, among others, significantly contribute to the proliferation and development of the Aedes aegypti mosquito -the virus vector 7-9 . Climate changes contribute to increase the number of people exposed to dengue to more than 2 billion and the projections for 2085 suggest that approximately 5 to 6 billion people (50 to 60% of the world's population) will be at risk regarding the disease transmission 10 .The seasonal dynamics of the dengue vector is commonly associated with climate changes and fluctuations 9,11 , which include: temperature increase and variations in rainfall and relative air humidity, conditions that favor a higher number of available breeding sites and, consequently, the development of the vector. The latter presents two distinct stages: aquatic, with the development phases of egg, larva and pupa, and terrestrial, which corresponds to the adult mosquito. Both stages are subject to environmental and climate changes 12,13 ...

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Distribution of dengue vectors in neighborhoods with different urbanization types of Manaus, state of Amazonas, Brazil

Cited by 34 publications

References 26 publications

Developing new approaches for detecting and preventing Aedes aegypti population outbreaks: basis for surveillance, alert and control system

Developing new approaches for detecting and preventing Aedes aegypti population outbreaks: basis for surveillance, alert and control system

Eggs viability of Aedes aegypti Linnaeus (Diptera, Culicidae) under different environmental and storage conditions in Manaus, Amazonas, Brazil

A ocorrência da dengue e variações meteorológicas no Brasil: revisão sistemática

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