Temporal distribution of Aedes aegypti Linnaeus (Diptera, Culicidae), in a Hospital in Cuiabá, State of Mato Grosso, Brazil

Abstract

ABSTRACT. Temporal distribution of Aedes aegypti Linnaeus (Diptera, Culicidae), in a Hospital in Cuiabá, State of Mato Grosso, Brazil. This study aimed at registering and monitoring the presence of Aedes aegypti in the University Hospital Júlio Muller, Cuiabá-MT, as well as investigating the influence of temperature and rainfall on its temporal distribution and egg densities in ovitraps. The study was performed from April/2007 to March/2008, utilizing ovitraps with 10% of hay infusion and a wood paddle as an oviposition substrate. For surveillance, one ovitrap was placed in each of the 12 points distributed throughout the hospital. Ovitraps were collected monthly at the end of a 5-day installation period. After egg counting, wood paddles were immersed in water to allow larval eclosion for species identification through optical microscopy. Egg Density Index (EDI), Positive Ovitraps Index (POI), and Mean Number of Eggs (MNE) were used for data analysis. The presence of A. aegypti in the hospital was registered throughout the study period, except in July. The MNE was proportionally higher in the internal area (n= 8.47 eggs/paddle) when compared to the external area (n= 5.46 eggs/paddle), and was higher in September/October 2007 and January/February 2008. A significant increase in EDI, POI and MNE was registered in periods where the average temperature was higher, and the increase in POI was also concomitant with an increase in rainfall. The continuous presence of A. aegypti in the hospital throughout the study period, points out the need of including this mosquito in the arthropod control list in this environment. This is particularly important, considering that A. aegypti is an important vector of several arboviroses.

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“…aegypti sites also has been reported in India where there were container indices of 28.3% in schools and 45.1% in hospitals . Similar findings used ovitraps in hospitals in Brazil (Carvalho-Leandro et al 2010). A study in Iquitos, Peru, sampled schools, factories, ports, public markets, petrol stations, commercial zones, and airports and found pupal and adult Ae.…”

Dengue virus detection in Aedes aegypti larvae from southeastern Brazil

“…Oviposition traps have been used in several studies to monitor vector populations (Almeida et al , Fantinatti et al , Costa et al , Miyazaki et al , Carvalho‐Leandro et al , Resende et al ). Braga et al () and Cardoso et al () found higher sensitivity from oviposition traps than from larval surveys to detect Ae.…”

Effective surveillance of vector dynamics of Aedes aegypti in a hospital setting in Cuiabá, Mato Grosso, Brazil

“…This has previously been reported by Brazilian researchers, who highlighted that sources of external domestic reservoirs can provide conditions that favor the maintenance and domiciliation of Aedini populations. In contrast, the study by Carvalho-Leandro et al [3] showed a higher mean egg density in internal areas compared to external areas.…”

“…In a study conducted in the same city, Carvalho-Leandro et al [3] found that A. aegypti was present in the hospital throughout the study, except for one month. They evaluated the temporal distribution of this mosquito and the influence of environmental variables on egg densities.…”

“…The epidemiological significance of arthropods is not restricted to their role as biological vectors; mechanical vectors must also be considered, since it may be possible to manipulate some of the determinants involved and thus reduce the frequency of the occurrence of the disease in question [1][2][3]. Poor maintenance of hospital structures increases the occurrence of insect vectors, which enter hospitals through windows, doors, clothes, the sanitation system, and transportation carts [1,3]; vectors have been found throughout hospital premises [2,4,5]. To avoid potential problems, constant and routine maintenance and surveillance are required.…”