field trial in chiapas, mexico, of a rapid detection method for malaria in anopheline vectors with low infection rates.a method consisting of filtration of up to 100 macerated mosquitoes in a batch, followed by fixation with glutaraldehyde and concentration of filtrate by centrifugation has been developed to rapidly assess malaria infection in anopheline mosquitoes. determination of the presence of sporozoites is made by observation of a sample of the final filtrate with a phase microscope. the method is simple and field adaptable, essential factors for the application of any technique to large scale field opera ...19863513640
remote sensing as a landscape epidemiologic tool to identify villages at high risk for malaria transmission.a landscape approach using remote sensing and geographic information system (gis) technologies was developed to discriminate between villages at high and low risk for malaria transmission, as defined by adult anopheles albimanus abundance. satellite data for an area in southern chiapas, mexico were digitally processed to generate a map of landscape elements. the gis processes were used to determine the proportion of mapped landscape elements surrounding 40 villages where an. albimanus abundance ...19947943544
plasmodium vivax sporozoite rates from anopheles albimanus in southern chiapas, mexico.anopheles albimanus mosquitoes were collected from august 1984 to november 1987 on intra- and peridomicile human bait in rancheria el gancho, chiapas, mexico. the mosquitoes were desiccated and stored in silicon chambers from 3 mo to 3 yr post-collection prior to being assayed using a direct enzyme-linked immunosorbent assay to detect plasmodium vivax predominant-type sporozoite protein. peridomicile-collected mosquitoes had a 10-fold higher sporozoite rate than those collected indoors, but only ...19948195955
effects of transmission-blocking immunity on plasmodium vivax infections in anopheles albimanus populations.two colonized populations of anopheles albimanus isolated from the suchiate region, chiapas state, mexico, were compared for their susceptibility to coindigenous plasmodium vivax. groups of mosquitoes were fed in vitro with either autologous donor blood or the same blood cells substituted with serum negative for anti-gametocyte antibody. significant differences in susceptibility between the 2 colonies were encountered if the autologous blood from a patient was fed to mosquitoes: mean infection r ...19948308663
dynamics of population densities and vegetation associations of anopheles albimanus larvae in a coastal area of southern chiapas, mexico.spatial and seasonal variations on anopheles albimanus larval densities and their plant associations were investigated in larval habitats in southern mexico between april 1989 and may 1990. thirty-four plant groups were dominant in larval habitats. dense larval populations were associated with 3 genera of plants, cynodon, echinocloa and fimbristylis and no larvae were found in habitats with salvinia and rhizophora. low significant positive or negative associations were documented with the other ...19938468574
anopheles albimanus (diptera: culicidae) host selection patterns in three ecological areas of the coastal plains of chiapas, southern mexico.the host-feeding patterns of anopheles albimanus wiedemann were described and the effect of host availability on these patterns was assessed in three different ecological areas of coastal chiapas, mexico. resting mosquitoes were collected indoors and outdoors during rainy seasons. a 20% sample of blood-fed mosquitoes was tested to determine the source of the blood meal using an elisa. the unweighted human blood index (hbi) of an. albimanus in the three areas ranged from 0.11 to 0.21. this mosqui ...19938510111
landscape surrounding human settlements and anopheles albimanus (diptera: culicidae) abundance in southern chiapas, mexico.landscape characteristics that may influence important components of the anopheles albimanus wiedemann life cycle, including potential breeding sites, suitable diurnal resting sites, and possible sources of blood meals, were analyzed at 14 villages in a malarious area of southern mexico. an. albimanus adults were collected weekly in each village using uv-light traps between july 1991 and august 1992. based on rainfall, the study was divided into 6 seasonal periods. villages were considered to ha ...19968906903
assessment of a remote sensing-based model for predicting malaria transmission risk in villages of chiapas, mexico.a blind test of two remote sensing-based models for predicting adult populations of anopheles albimanus in villages, an indicator of malaria transmission risk, was conducted in southern chiapas, mexico. one model was developed using a discriminant analysis approach, while the other was based on regression analysis. the models were developed in 1992 for an area around tapachula, chiapas, using landsat thematic mapper (tm) satellite data and geographic information system functions. using two remot ...19979063370
resistance management strategies in malaria vector mosquito control. baseline data for a large-scale field trial against anopheles albimanus in mexico.a high level of ddt resistance and low levels of resistance to organophosphorus, carbamate and pyrethroid insecticides were detected by discriminating dose assays in field populations of anopheles albimanus in chiapas, southern mexico, prior to a large-scale resistance management project described by hemingway et al. (1997). biochemical assays showed that the ddt resistance was caused by elevated levels of glutathione s-transferase (gst) activity leading to increased rates of metabolism of ddt t ...19989737593
remote sensing of tropical wetlands for malaria control in chiapas, mexico.malaria, transmitted by anopheline mosquitoes, remains a serious health problem in the tropics. most malaria eradication efforts focus on control of anopheline vectors. these efforts include the nasa di-mod project, whose current goal is to integrate remote sensing, geographic information systems (gis), and field research to predict anopheline mosquito population dynamics in the pacific coastal plain of chiapas, mexico. field studies demonstrate that high larval production of anopheles albimanus ...199411539870
cyanobacteria associated with anopheles albimanus (diptera: culicidae) larval habitats in southern mexico.cyanobacteria associated with anopheles albimanus wiedemann larval habitats from southern chiapas, mexico, were isolated and identified from water samples and larval midguts using selective medium bg-11. larval breeding sites were classified according to their hydrology and dominant vegetation. cyanobacteria isolated in water samples were recorded and analyzed according to hydrological and vegetation habitat breeding types, and mosquito larval abundance. in total, 19 cyanobacteria species were i ...200212495179
effect of novaluron (rimon 10 ec) on the mosquitoes anopheles albimanus, anopheles pseudopunctipennis, aedes aegypti, aedes albopictus and culex quinquefasciatus from chiapas, mexico.dengue fever is a serious problem in mexico and vector control has not been effective enough at preventing outbreaks. malaria is largely under control, but it is important that new control measures continue to be developed. novaluron, a novel host-specific insect growth regulator and chitin synthesis inhibitor, has proved to be effective against agricultural pests, but its efficacy against larval mosquito vectors under field conditions remains unknown. in accordance with the world health organiz ...200617199749
[behavioral response of anopheles albimanus to volatile compounds collected inside houses from the south of chiapas, mexico].to determine effects of volatile compounds in homes on the behavioral response of anopheles albimanus.200818852933
limnological and botanical characterization of larval habitats for two primary malarial vectors, anopheles albimanus and anopheles pseudopunctipennis, in coastal areas of chiapas state, mexico.field surveys of mosquito breeding sites on the pacific coastal plain and foothill regions of southern chiapas, mexico, were carried out in the dry and wet seasons of 1988. at each site, selected environmental variables were measured or estimated, presence and percent cover of aquatic plants recorded, a water sample collected for subsequent analyses, and 10-30 dips made for mosquito larvae. logistic regression and discriminant analyses revealed that the occurrence of anopheles albimanus larvae i ...19902098467
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