Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 20 de 109
Filter
1.
Article in Chinese | WPRIM | ID: wpr-920783

ABSTRACT

Objective To investigate the resistance level of adult Aedes albopictus to commonly used insecticides in urban areas of Huzhou City, and analyze the trend of insecticide resistance. Methods Aedes albopictus larvae were collected from different urban areas of Huzhou City in 2019 and 2020. The larvae were reared to adults for determining resistance using the WHO standard test kits by contact tube method. Results The mortality was 97.06%‒100.00% in adult Aedes albopictus mosquitoes exposed to 0.4% beta-cypermethrin, 0.1% deltamethrin, 0.5% malathion, 0.05% propoxur and 3% permethrin in 2019. While the adult mosquitoes exposed to 0.4% beta Cypermethrin, 0.08% beta Cypermethrin, 0.03% deltamethrin, 0.4% permethrin, 0.5% malathion and 0.02% propoxur in 2020, the adjusted mortality were 98.58%, 89.09%, 85.64%, 91.34%, 91.43% and 100% respectively . When the insecticide doses on medicated paper were high, the Huzhou populations of Aedes albopictus were sensitive to beta-cypermethrin, deltamethrin, malathion and propoxur, and showed suspected resistance to permethrin. While the Aedes albopictus were exposed to low testing dose, they showed suspected resistance to beta-cypermethrin, deltamethrin, permethrin and malathion, but remained to be sensitive to propoxur. Conclusion The adult Aedes albopictus in Huzhou City from 2019 to 2020 was still sensitive to propoxur, but their resistance to malathion changes from sensitive to resistant. When the contact tube method is used for insecticide resistance, it is suggested that the accurate diagnostic dose should be obtained first before conducting further insecticide resistance tests.

2.
Article in Chinese | WPRIM | ID: wpr-920782

ABSTRACT

Objective To investigate the type and consumption of sanitary insecticides used in Putuo District of Shanghai, determine the current resistance of Aedes albopictus to the insecticides, and explore the causes of regional variations in insecticide resistance spectrum. Methods Public and private institutions of pest control operation were investigated on the use of sanitary insecticides. Dipping method and tube method were used to measure the insecticide resistance of Aedes albopictus, including larvae and adults. Results The main insecticides used in residential areas and governmental units was β-cypermethrin, while that in markets and public environment was propoxur. In addition, and the insecticides in dengue control program was λ-cyhalothrin. Aedes albopictus larvae had medium resistance to parathion, and were sensitive to propoxur, with insignificant change within three years. Their resistance to permethrin and deltamethrin was medium and high, respectively. Moreover, resistance to β-cypermethrin increased over years. In contrast, resistance of adult Aedes albopictus differed by area, except consistently being sensitive to fenitrothion. Conclusion Multiple sanitary insecticides have been used in Putuo District. In addition, Aedes albopictus has different resistance to these insecticides by area. It suggests that resistance surveillance should be promoted, which may be crucial for scientific application of insecticides and impede the development of potential resistance.

3.
Article in Chinese | WPRIM | ID: wpr-920781

ABSTRACT

Objective To investigate the resistance development of Aedes albopictus to commonly used insecticides in Yangpu District of Shanghai, China, and to provide scientific bases for the control of A. albopictus and the emergency treatment of dengue fever. Methods The larva immersion method recommended by WHO was used to assay the median lethal concentration (LC50) of A. albopictus larva. SPSS 25.0 was used to calculate the toxicity baselines of insecticides. Results A. albopictus kept a medium resistance to beta-cypermethrin, and the resistance ratios were 14.44, 10.00, 17.78, respectively, in 2015, 2017, 2019. The mosquitos kept a high resistance to permethrin, and the resistance ratios were 54.00, 140.00, 52.00 respectively, in 2015, 2017, 2019. Besides, A. albopictus also kept a medium resistance to propoxur, and the resistance ratios were 15.34, 13.06, 10.83 respectively, in 2015, 2017, 2019. To deltamethrin, A. albopictus showed high resistance in 2015 and medium resistance in 2017, the resistance ratios were 40.00 and 35.00. To temephos, A. albopictus showed low resistance in 2015, with the resistance ratio of 9.38. Conclusion A. albopictus has developed high resistance to permethrin in Yangpu District of Shanghai, and cautious and reduced use of permethrin is suggested. It is necessary to implement and adopt the strategy of comprehensive management, in order to establish the long-term mechanism for mosquito control and prevention.

4.
Article in Chinese | WPRIM | ID: wpr-920780

ABSTRACT

Objective To determine the seasonal fluctuation and population distribution of Aedes albopictus in Jiading District, and provide scientific evidence for the prevention and control of dengue fever and other Aedes-borne diseases. Methods In 2020, the mosq-ovitrap method and mosq-ovitrap index (MOI) were used to monitor and evaluate the density of Aedes albopictus in Jiading District. Spatial and temporal distribution of Aedes albopictus was determined. Chi-square test was used for statistical analysis. Results In 2020, the annual average MOI was determined to be 4.10, which was under safety threshold. The seasonal fluctuations showed a unimodal distribution, which peaked in July. The fluctuation trend in urban area was similar to the overall trend, while that in the non-urban area showed a bimodal distribution with peaks in June and August. The density of Aedes albopictus at different monitoring sites varied widely,with the highest MOI (6.64) at Anting town and the lowest MOI (2.09) at Huating town. The distribution of Aedes albopictus in different habitats also varied widely; the highest density was observed in environments as waste collection stations and construction sites, with the highest MOI 33.33 in waste collection stations in peak season. The MOI value of Aedes albopictus in residential areas was significantly higher than that in non-residential areas (χ2 = 6.082, P = 0.014). Conclusion Aedes albopictus is quite common in Jiading District. In certain areas, Aedes density may exceed the safety threshold from May to September. More targeted mosquito control measures should be implemented in waste collection stations, construction sites and residential areas.

5.
Article in Chinese | WPRIM | ID: wpr-920779

ABSTRACT

Objective Based on mosq-ovitrap monitoring method of Aedes albopictus, to determine the spatial and temporal distribution of Aedes albopictus in Songjiang District and provide scientific evidence for prevention and control of mosquito-borne diseases. Methods From May to October, 2018‒2020, density of Aedes albopictus was monitored by using the mosq-ovitrap method. Sub-districts and towns were used as the monitoring units and the difference in mosquito ovitrap index (MOI) was compared by seasons, years and habitats. Results The total number of positive mosquito ovitraps was 1049 in 2018‒2020, and the average MOI was 8.10. Four sub-districts/towns in the urban area and the northern area had the relatively high MOIs. Moreover, MOIs in residential and external environments were higher than other habitats. In addition, MOI of Aedes albopictus decreased over years from 2018 to 2020. Conclusion Aedes albopictus is widely distributed in Songjiang District. Although the number of mosquito decreased over years after the implementation of mosquito control measures, reproduction of mosquito remains excessive in some areas and seasons. It is necessary to perform targeted control measures based on comprehensive monitoring methods.

6.
Ginecol. obstet. Méx ; 90(4): 364-370, ene. 2022. graf
Article in Spanish | LILACS-Express | LILACS | ID: biblio-1385034

ABSTRACT

Resumen INTRODUCCION: El dengue es causado por un virus perteneciente a la familia Flaviviridae; existen cuatro serotipos relacionados: DENV-1, DENV-2, DENV-3, DENV-4 trasmitidos por picadura del mosquito hembra de las especies Aedes aegypti y Aedes albopictus. CASO CLÍNICO: Paciente de 19 años, con 36 semanas de embarazo por fecha de la última menstruación y diagnóstico de dengue por serología positiva (Ag-NS1) y trombocitopenia (68,000/mm3). El padecimiento se inició con fiebre de 38.0°C, de tres días de evolución acompañado de artralgias, mialgias, dolor retro ocular y contracciones uterinas. La paciente se ingresó al área de terapia intensiva debido a insuficiencia respiratoria (que ameritó ventilación mecánica invasiva), insuficiencia renal aguda y hematológica, posterior a cesárea. Ameritó reintervención quirúrgica por sangrado intrabdominal por trastornos de la coagulación. Durante su estancia hospitalaria requirió 50 concentrados plaquetarios, 8 concentrados eritrocitarios, 14 plasmas frescos y 4 aféresis plaquetarias. Después de 14 días de estancia hospitalaria se dio de alta por mejoría clínica. CONCLUSIÓN: Si no se actúa inmediatamente, el dengue grave es una causa de desenlace fatal madre-hijo. La identificación oportuna de las complicaciones agregadas a esta enfermedad en la embarazada denota la importancia de la prevención, el diagnóstico temprano y su tratamiento. De igual manera, es importante que en pacientes embarazadas con esta comorbilidad el servicio de Obstetricia intervenga oportunamente en la vigilancia pre y posquirúrgica.


Abstract BACKGROUND: Dengue is caused by a virus belonging to the Flaviviridae family, there are four related serotypes: DENV-1, DENV-2, DENV-3, DENV-4 transmitted by the bite of the female mosquito of the species Aedes aegypti and Aedes albopictus. CLINICAL CASE: 19-year-old female patient, 36 weeks pregnant by date of last menstrual period and diagnosed with dengue due to positive serology (Ag-NS1) and thrombocytopenia (68,000/mm3). The illness started with fever of 38.0°C, of three days of evolution accompanied by arthralgias, myalgias, retro ocular pain and uterine contractions. The patient was admitted to the intensive care unit due to respiratory failure (which required invasive mechanical ventilation), acute renal and hematologic failure, following cesarean section. She required surgical reintervention for intra-abdominal bleeding due to coagulation disorders. During her hospital stay she required 50 platelet concentrates, 8 erythrocyte concentrates, 14 fresh plasmas and 4 platelet apheresis. After 14 days of hospital stay he was discharged due to clinical improvement. CONCLUSION: If no immediate action is taken, severe dengue is a cause of fatal mother-child outcome. The timely identification of the complications associated with this disease in pregnant women highlights the importance of prevention, early diagnosis and treatment. Similarly, it is important that in pregnant patients with this comorbidity, the obstetrics service should intervene in a timely manner in pre- and post-surgical surveillance.

7.
Tropical Biomedicine ; : 446-452, 2021.
Article in English | WPRIM | ID: wpr-906557

ABSTRACT

@#Inundated with escalating dengue outbreaks, there is an urgent call to find alternate potential vector control methods as the currently employed method fails to curb the expanding of dengue virus transmission in Malaysia. Supported by this aim, we are interested in exploiting the potential of Ipomoea cairica leaves extract towards primary and secondary vectors of dengue fever, Aedes aegypti and Aedes albopictus. To assess the effectiveness of this plant extracts towards Aedes larvae, we carried out two complementary analyses. First, we observed the comparative effectiveness of larvicidal activity I. cairica extract against the laboratory and field strains of Ae. aegypti and Ae. albopictus. Then, we determined the effective lethal dose of this plant extract against Aedes larvae using log-probit regression analysis of the SPSS 20.0 programme. Results from bioassay demonstrated that I. cairica leaves extract was highly effective to induce larvicidal mortality of Ae. albopictus and Ae. aegypti within 24 and 48 hours post-treatment. Results from the factorial analysis of variance (ANOVA) also indicated that there were significant differences in larvicidal activity between species and strains used (P<0.05). It is interesting to notify that the sequence of effectiveness for the larvicidal activities of I. cairica acethonilic leaves extract is in the manner; Ae. albopictus field strain > Ae. aegypti laboratory strain > Ae. aegypti field strain > Ae. albopictus laboratory strain. The I. cairica leaves extract displayed high larvicidal activity against Ae. albopictus as compared to Ae. aegypti. This is the first evaluation involving the comparison of I. cairica leaves extract effects for the laboratory strain and field strain of Ae. albopictus and Ae. aegypti.

8.
Tropical Biomedicine ; : 196-204, 2021.
Article in English | WPRIM | ID: wpr-904742

ABSTRACT

@# Susceptibility status of Aedes albopictus (Skuse) sampled from residential areas in Interior, Sandakan and Tawau divisions of Sabah, Malaysia, was evaluated based on the WHOrecommended doses of organochlorine and organophosphate larvicides. To determine susceptibility status, larval bioassays were carried out and post 24-hour mortalities based on WHO resistance classifications were adopted. The results demonstrated that Ae. albopictus larvae were resistant toward 5 out of the 8 larvicides tested. Larvae from all populations were resistant against bromophos, fenitrothion, malathion, temephos and dichlorodiphenyltrichloroethane (DDT), with mortalities ranging from 0.00 to 89.33%. Dieldrin, on the other hand, could induce 100.00% mortalities in all populations, followed by fenthion and chlorpyrifos, with mortalities ranging from 97.33 to 100.00% and 81.33 to 100.00% respectively. Despite most populations exhibiting similitude in their resistance status, larvae from Sandakan exhibited the highest resistance level whereas the lowest level was observed in Keningau. In view of the inadequacy of some larvicides in controlling Ae. albopictus in this study, integrated management such as insecticide rotation or combination of interventions is warranted.

9.
Tropical Biomedicine ; : 171-179, 2021.
Article in English | WPRIM | ID: wpr-904712

ABSTRACT

@#Diseases such as malaria, dengue, Zika and chikungunya remain endemic in many countries. Setting and deploying traps to capture the host/vector species are fundamental to understand their density and distributions. Human effort to manage the trap data accurately and timely is an exhaustive endeavour when the study area expands and period prolongs. One stop mobile app to manage and monitor the process of targeted species trapping, from field to laboratory level is still scarce. Toward this end, we developed a new mobile app named “PesTrapp” to acquire the vector density index based on the mobile updates of ovitraps and species information in field and laboratory. This study aimed to highlight the mobile app’s development and design, elucidate the practical user experiences of using the app and evaluate the preliminary user assessment of the mobile app. The mobile app was developed using mobile framework and database. User evaluation of the mobile app was based on the adjusted Mobile App Rating Scale and Standardized User Experience Percentile Rank Questionnaire. The process flows of system design and detailed screen layouts were described. The user experiences with and without the app in a project to study Aedes surveillance in six study sites in Selangor, Malaysia were elucidated. The overall mean user evaluation score of the mobile app was 4.0 out of 5 (SD=0.6), reflects its acceptability of the users. The PesTrapp, a one-stop solution, is anticipated to improve the entomological surveillance work processes. This new mobile app can contribute as a tool in the vector control countermeasure strategies.

10.
Salud pública Méx ; 62(4): 447-449, jul.-ago. 2020. tab, graf
Article in English | LILACS-Express | LILACS | ID: biblio-1377337

ABSTRACT

Abstract: Objective: To evaluate the prevalence of Wolbachia infections in Aedes spp. field populations from cemeteries of Southern Mexico. Materials and methods: Six cemeteries were selected to be sampled in the central part of the Soconusco region, Chiapas. Aedes albopictus and Ae. aegypti mosquitoes were collected during the rainy season of 2015. Females were analyzed individually by PCR to determine the presence of Wolbachia. Results: A field overall prevalence of 38% was found; only Ae. albopictus mosquitoes were positive. Conclusion: Local strains of Wolbachia were detected and have the potential to be applied as a biological method for vector control.


Resumen: Objetivo: Evaluar la presencia de Wolbachia en poblaciones de campo de Aedes spp. en cementerios del Sur de México. Material y métodos: Se seleccionaron seis cementerios como sitios de colecta para las poblaciones silvestres de Aedes albopictus y Ae. aegypti, en la región del Soconusco, Chiapas, durante la época de lluvias 2015. Se determinó la infección por Wolbachia en hembras individuales por PCR. Resultados: Se obtuvo una infección de 38% por Wolbachia en Ae. albopictus. Conclusión: Existen cepas locales de Wolbachia en los mosquitos y poseen el potencial de aplicarse como medida de control biológico de vectores.

11.
Rev. Soc. Bras. Med. Trop ; 53: e20190504, 2020. tab, graf
Article in English | LILACS | ID: biblio-1101440

ABSTRACT

Abstract INTRODUCTION: The study of the landscape ecology, biological microhabitat, and epidemiological implications for the distribution of the main vectors Aedes aegypti and Aedes albopictus contribute to the prevention and control actions regarding the diseases they transmit. METHODS: This study sought to assess data on positive properties of the vector control program activities from 1998 to 2010. An entomological survey was also carried out on a sample of buildings collecting larvae and pupae from containers between October and April (spring / summer) from 2002 to 2005. We assessed the physico-chemical data of the water in 20% of positive containers. The vegetation and urbanization were assessed with the aid of satellite images and microenvironments were classified as urbanized, woods, and shrubs. The data were analyzed using statistical and geoprocessing software. RESULTS: Ae. aegypti and Ae. albopictus colonized all types of microhabitats and microenvironments, predominantly in the urbanized area, in isolation and in coexistence. The microhabitat of Ae. aegypti showed a temperature gradient greater than that of Ae. albopictus, and there was an association with urbanized areas for the first species and wooded areas for the last species. CONCLUSIONS: Landscape ecology and intra-urban differences favor different microclimates, which contribute to the coexistence of species in the urban environment in an area close to the forest, raising the risk of other arbovirus infections in urban areas. The ecological niche should be considered for Ae. albopictus. Entomological and virologic monitoring are suggested as arbovirus surveillance actions in urban infested centers near preserved forests.


Subject(s)
Animals , Ecosystem , Aedes/physiology , Mosquito Vectors/physiology , Arbovirus Infections/transmission , Seasons , Urban Population , Brazil , Population Density , Aedes/classification , Spatial Analysis , Animal Distribution , Mosquito Vectors/classification
12.
Article in Chinese | WPRIM | ID: wpr-876201

ABSTRACT

Objective To investigate the resistances of larva and adult of Aedes albopictus to common insecticides in a county of Jining City, after the dengue fever outbreak in 2017, and to provide scientific support for rational use of insecticides. Methods The insecticide resistance was tested with exposure tubes for adult mosquitoes and dipping method for larvae.After collecting the larvae and breeding for one generation, the resistances of larvae were determined with the late third-instar or early fourth-instar larvae, and the resistance of adults was tested with the female mosquitoes at 3-5 days post eclosion. Results The insecticides mainly used in the county of Jining City in 2018 were pyrethroids such as permethrin, β-cyhalothrin, α-cypermethrin, and organic phosphorus pesticides such as phoxim.The median lethal concentration (LC50) values in the larva to temephos, deltamethrin, permethrin, beta-cypermethrin were 0.006 mg/L(RR=3.75), 0.021 mg/L(RR=52.50)、0.209 mg/L(RR=104.50)、0.016 mg/L (RR=17.78), with the lowest resistance to temephos and the highest to permethrin.Adult mosquitoes were sensitive to permethrin, with a knockdown rate of 97.62% and a mortality rate of 100%.When exposed to propoxur and malathion, the knockdown rates were 97.06% and 91.89%, the mortality rates were 97.06% and 93.24%.Aedes albopictus larvae were resistant to deltamethrin, α-cypermethrin, β-cyhalothrin, β-cypermethrin, with the knockdown rates of 88.00%, 95.31%, 91.04%, 97.10%, and the mortality rates were all less than 80.00%. Conclusion The larvae and adult mosquitoes of Aedes albopictus in the county of Jining City have developed different degrees of resistance to commonly used insecticides.The resistance should be under regular monitoring and the use of insecticides should be scientific and rational to delay the resistance production.

13.
Article in English | WPRIM | ID: wpr-829454

ABSTRACT

@#Introduction: Aedes albopictus is known for its aggressiveness towards human and recently expanded to more countries outside the native regions. Thus, the demographic parameters of Aedes albopictus are important to determine the characteristics of this species mosquitoes in terms of the reproduction rates and dispersal distance. Materials and Methods: This study, was performed using a Shah Alam strain of Aedes albopictus originally collected in twenty district areas of the central zone of Shah Alam. This research applies field work-study with a cross-sectional design to investigate the demographic parameters of Aedes albopictus. The demographic evaluation of Aedes albopictus was conducted under the control environment in insectarium. Results: Investigation on the demographic parameters of Aedes albopictus clearly showed that there is a significance different observed in the total number of mosquito eggs produced in both high and low incidence rate IR areas (p=0.03). In contrast, other parameters showed insignificant value between high and low IR areas. Conclusion: The key to control the mosquito vectors population is by tracking the vector’s life cycle including its survival. Therefore, the outcome of this study may provide as a baseline to estimate the dengue outbreak in the current episystem.

14.
Horiz. sanitario (en linea) ; 18(2): 159-165, may.-ago. 2019. tab, graf
Article in English | LILACS-Express | LILACS | ID: biblio-1039983

ABSTRACT

Resumen: Objetivo: Determinar la distribución de Aedes albopictus (Skuse 1895) en Tabasco México 2015-2018. Material y métodos: Se realizó un estudio descriptivo observacional transversal con un componente cuantitativo, durante enero de 2015 a julio 2018 se enviaron al laboratorio estatal de salud pública un total de 4,090 muestras de larvas de mosquitos de Aedes sp. para identificación taxonómica proveniente de los 17 municipios de Tabasco con 38 localidades prioritarias, las cuales fueron colectadas del sistema de monitoreo estatal de vigilancia entomológica con ovitrampas. Resultados: 3,882 (94.91%) corresponden a Aedes aegypti y 208 (5.08%) a Aedes albopictus. La distribución de Aedes albopictus se identificó en 9 municipios que representa 52.94% de los municipios afectados con presencia del vector y 44.74% de localidades muestreadas positivas en el estado de Tabasco. Conclusiones: Con el presente estudio se logró determinar la presencia y distribución de Aedes albopictus, cuya dispersión en el estado se encuentra en progreso ya que podría colonizar los 17 municipios que componen el estado por las características de clima y vegetación, lo que plantea nuevos retos en salud pública en cuanto a la prevención y control de los arbovirus.


Abstract: Objective: To identify the distribution of Aedes albopictus (Skuse 1895) in Tabasco Mexico from 2015 to 2018. Material and Method: A cross-sectional observational descriptive study with a quantitative component was carried out. During January 2015 to July 2018, a total of 4,090 samples of Aedes sp. mosquito larvae were sent to the state public health laboratory for taxonomic identification from the 17 municipalities of Tabasco with 38 priority localities, which were collected from the state monitoring system of entomological surveillance with ovitraps. Results: Of the samples collected, 3,882 (94.91%) corresponded to Aedes aegypti and 208 (5.08%) to Aedes albopictus. The distribution of Aedes albopictus was identified in 9 municipalities representing 52.94% of affected municipalities with the presence of the vector and corresponds to 44.74% of localities sampled positive in the state of Tabasco. Conclusions: In this study it was determined the presence and distribution of Aedes albopictus, its dispersion in the state is in progress since it could colonize the 17 municipalities of the state. Due to the climate and vegetation characteristics, which poses new challenges in public health in terms of the prevention and control of arboviruses.


Resumo: Objetivo: Analisar indicadores de saúde, com base nos resultados obtidos pelas unidades de saúde no Chile, durante o período 2010-2014. Materiais e métodos: Um estudo descritivo é realizado e múltiplas correspondências são aplicadas. São utilizados 75 indicadores básicos de saúde publicados pelo Ministério da Saúde, indicadores demográficos, estatísticas vitais, riscos para a saúde e acesso aos cuidados. Cada indicador foi atribuído um resultado esperado e comparado com o resultado real obtido, por região e país. Resultados: Os indicadores de risco para a saúde foram caracterizados principalmente porque, em 50% ou mais das regiões analisadas, obtiveram resultado semelhante ao esperado. Diferentemente dos indicadores estatísticos vitais, onde 49% e menos das regiões tiveram resultado semelhante ao esperado no mesmo período. Ao mesmo tempo, os indicadores demográficos foram associados an um resultado esperado positivo e, ao contrário, os indicadores de acesso ao atendimento foram associados an um resultado esperado negativo no período analisado. Conclusão: Devido ao impacto na população, qualquer indicador de gestão em saúde deve ser considerado pelos gestores das redes de saúde para orientar as estratégias a serem implementadas nos estabelecimentos que compõem as redes públicas de saúde.


Résumé : Objectif: Analyser les indicateurs de santé sur la base des résultats obtenus par les établissements de santé au Chili durant la période 2010-2014. Matériel et méthodes: L'étude est descriptive et inclut de plus l''analyse des correspondances multiples en utilisant 75 indicateurs sanitaires de base publiés par le Ministére de la Santé: indicateurs démographiques, statistiques de l'état civil, risques pour la santé et accés aux soins. Un résultat attendu a été attribué á chaque indicateur et comparé au résultat réel obtenu, par région et par pays. Résultats: Les indicateurs de risques pour la santé se sont caractérisés principalement par le fait qu'ils ont obtenu un résultat similaire á celui attendu dans 50% ou plus des régions analysées. Par contre, les indicateurs de statistiques de l'état civil ont donné, pour la meme période, un résultat similaire á celui attendu dans 49% ou moins des régions. Dans le meme temps, les indicateurs démographiques se sont associés á un résultat attendu positif et, au contraire, les indicateurs d'accés aux soins se sont associés á un résultat attendu négatif pour la période analysée. Conclusions: En raison de l'impact sur la population, tout indicateur de gestion de la santé devrait etre pris en compte par les gestionnaires de réseaux de santé afin d'orienter les stratégies á mettre en reuvre dans les établissements constituant les réseaux de soins de santé publique.

15.
Clinics ; 74: e675, 2019. tab, graf
Article in English | LILACS | ID: biblio-1019708

ABSTRACT

The present study aimed to review literature on studies of dengue cases conducted over 30 years in the state of Ceará. Between November 2015 and January 2016, articles published in Portuguese and English in 7 databases were searched using keywords and a Boolean operator. A total of 191 articles were identified in the databases; 133 were excluded according to the exclusion criteria, and 58 were included in the study. Of the 58 articles analyzed, 6 reported data from Brazil; including the Northeast region and the state of Ceará; 41 reported data for only the city of Fortaleza; 7 reported data for the state of Ceará; 4 reported data for cities in the interior of the state; and 3 included only children. The studies adopted different approaches and focused on different aspects of the disease. Study outcomes included the identification of serological, epidemiological, clinical, and laboratory characteristics; potential larvicides and biological predators of mosquitoes; potential antiviral agents; vector density characteristics; and educational dengue prevention and control strategies. Additionally, one vaccine trial was included. Although studies on dengue in the state of Ceará are scarce, they are encompassing, including several lines of research, and the number of studies and reports on dengue in the state of Ceará continues to increase.


Subject(s)
Humans , Animals , Endemic Diseases/statistics & numerical data , Aedes/classification , Dengue/epidemiology , Mosquito Vectors/physiology , Predatory Behavior , Research Design , Species Specificity , Brazil/epidemiology , Endemic Diseases/prevention & control , Aedes/physiology , Dengue/prevention & control , Dengue/transmission
16.
Article in Chinese | WPRIM | ID: wpr-779401

ABSTRACT

Objective To disscus the applicability of three surveillance methods for Aedes albopictus in dengue risk indication. Methods Larval and adult mosquito surveillance were conducted in two villages of Guangzhou by using three vector monitoring methods. Meteorological data and dengue cases were obtained in the same period. Results The population dynamics of larvae and adult mosquitoes were affected by temperature and their overall trend was consistent, but there were differences between the abundance of larvae and adult mosquitoes. From December to February the next year, Breteau index(BI) ranged from 5.66 to 24.53 with a risk of level 1 to 3 for dengue fever, while the mosquito and oviposition positive index(MOI) and adult-mosquito density index(ADI) were 0 to 4.00 and 0 to 1 per man-hour, respectively, indicating no risk for dengue fever. In March, compared with BI which indicated a risk of level 3, MOI were 2.13 and 3.77, respectively, representing for no risk. ADI were 4 to 6 per man-hour, indicating a risk of level 1 and level 2, respectively. After April, the dengue risk level reflected by each indicator became to be consistent. Conclusions The risk of dengue fever indicated by BI is always higher than or equal to the risk indicated by the other two. Compared with BI, MOI and ADI are more sensitively in reflecting the activity of Ae. albopictus.

17.
Article in English | WPRIM | ID: wpr-782419

ABSTRACT

Abstract@#Introduction: The survivorship of mosquito is the most important aspect that affects its ability as a pathogen transmitting vector such as Aedes albopictus which is a vector of dengue. In this study, temperature stress effect on the survival of adult Aedes albopictus were investigated. Methods: It was conducted by manipulating different constant temperatures (15°C to 35°C) on juvenile stage of Ae. albopictus in natural and artificial container. Then, the development growth of adult mosquito was observed under laboratory condition. The effects of exposed temperature on certain biological parameters of adult mosquito were evaluated in terms of survival rates, longevity of female mosquito, fecundity rate, gonotrophic cycle and wing length of the adult mosquito. Results: In higher temperatures, the longevity of adult female was reduced and the highest longevity was found at optimum temperature (25°C) with average of 8.6 ± 0.18 days and 6.7 ± 0.29 days in natural and artificial container respectively. Both sexes showed a clearly tendency towards decreasing survivorship with increasing temperature where the highest survival was found at 15°C. Conversely, survival was lowest at a high temperature (30°C to 35°C). This study also showed that the wing length of both sexes was significantly affected by the rearing temperature where the longest found at 15°C and the shortest at 35°C. Conclusion: Thus, this study provide useful information of mosquito ecology in response to variation of temperatures.

18.
Article in English | WPRIM | ID: wpr-782416

ABSTRACT

Abstract@#Introduction: Vector surveillance in high-rise buildings is important to predict and monitor the presence of vectors regarding their abundance and distribution. In this study, the infestation profile of Aedes aegypti and Aedes albopictus species in different environmental settings were investigated. Methods: Four high-rise apartments in four different localities were selected for ovitrap surveillance. Fifty ovitraps were placed in semi indoor and outdoor settings. Results: A total of 507 (42.8%) from ovitraps showed the presence of the Aedes species larvae. Out of these, 170 (33.5%) of the positive ovitraps were those placed in semi indoor and 337 (66.5%) in outdoor. Of the total 16,613 Aedes larvae found, 4,130 (24.9%) were from semi indoor, and 12,483 (75.1%) from outdoor. In terms of distribution, Ae. albopictus was predominantly found in outdoor environments (POI=87.5%; MLT=36.45 larvae). Ae. aegypti was also found in outdoor environments (POI=14.89%; MLT=8.26 larvae). There was a significant difference in POI for both Ae. aegypti and Ae. albopictus in the two different environments but no significant difference was observed in MLT, indicating that the density of the Aedes species in both environments was well distributed. Conclusion: In this study, the patterns of Aedes habitat in high-rise apartments were observed. This study has shown an invasion and adaptation of Aedes mosquitoes into the ecosystems of high-rise buildings. It can be concluded that housing designs and the condition of the surrounding environment affects the infestation profile and the distribution of Aedes mosquitoes.

19.
Article in English | WPRIM | ID: wpr-782405

ABSTRACT

Abstract@#Introduction: An experimental study was conducted to determine the effects of synthetic chemical artificial toxic sugar bait (ATSB) on adult Aedes albopictus population in a controlled environment. The method uses an “attract and kill” concept and makes use of mosquito’s sugar-feeding behaviour. Formulations of ATSB consists of natural scents as an attractant, a sugar solution as a feeding stimulant and an oral toxin such as boric acid to eliminate mosquito population. Methods: The experiment was conducted in two phases; (i) the first phase aimed to determine the optimum sucrose concentration (10%, 30%, 50% and 70%) that will elicit the highest biting and fecundity rates in female mosquitoes and (ii) the second phase aimed to identify the ATSB, optimum sucrose from phase one incorporated with boric acid (0.1%,0.5% and 1%), that cause the highest mortality rates of adult female Aedes albopictus in a laboratory environment. Results: Seventy percent sucrose concentration was selected as the optimum sucrose concentration because the ingestion of the solution cause the highest biting and fecundity rates in mosquito compare to other sucrose concentrations. Meanwhile, 1% boric acid resulted in the highest mortality rate within two days of the experiment period. Conclusion: This study has identified the optimum sucrose concentration required to attract adult mosquitoes and highlighted the efficacy of 1% boric acid as an effective mosquito adulticide. The findings highlight the potential of ATSB as a valuable vector control method which could be further developed for future use.

20.
Chinese Journal of Epidemiology ; (12): 992-996, 2019.
Article in Chinese | WPRIM | ID: wpr-805754

ABSTRACT

Objective@#To analyze the genetic diversity of Aedes albopictus populations in the coastal areas of southern China by using the microsatellite markers to provide a basis for the control of vectors.@*Methods@#Genetic diversity and clustering analysis of Aedes albopictus populations were studied in the 7 microsatellite loci, in Hangzhou, Ningbo and Yiwu of Zhejiang province, Longyan of Fujian province, Guangzhou of Guangdong province, Nanning of Guangxi Zhuang Autonomous Region and Haikou of Hainan province.@*Results@#Numbers of different alleles (5.429-7.571), effective alleles (2.897-3.632), allele richness (5.236-7.170) and expected heterozygosity (0.538- 0.637) were detected from each of the Aedes albopictus population by using 7 microsatellite markers. The inbreeding coefficients appeared as 0.008-0.332, with heterozygote deficiency, in these populations. Fixation index of the whole populations was 0.058, suggesting that the genetic variation among the 7 populations was 5.8%. Data from the Neighbor-Joining clustering analysis showed that populations from Hangzhou and Yiwu belonged to one branch while Longyan and Guangzhou populations constituted another branch. Aedes albopictus populations of Nanning and Haikou showed great genetic variation but formed a single branch. Bayesian analysis on Aedes albopictus populations showed that the possible number of clusters was 3.@*Conclusions@#Based on 7 microsatellite loci, relatively high genetic diversity and medium level of genetic differentiation that increasing with the geographical distances, were found in these Aedes albopictus populations, from the coastal areas in southern China.

SELECTION OF CITATIONS
SEARCH DETAIL