| applicability of presence-absence and sequential sampling for ovitrap surveillance of aedes (diptera: culicidae) in chiang mai, northern thailand. | applicability of presence or absence sampling for ovitrap surveillance of aedes aegypti (l.) and aedes albopictus (skuse) was examined for data collected in chiang mai, northern thailand. distribution of eggs per trap was contagious but did not fit the negative binomial distribution with a common k. the relationship between the mean number of eggs per trap and the proportion of positive traps was described using gerrard & chiang's model, which does not assume particular distribution patterns. us ... | 1990 | 2388225 |
| scale pattern variations of aedes aegypti in chiang mai, northern thailand. | abdominal tergal scale pattern variations of aedes aegypti were studied in chiang mai, northern thailand for specimens reared from eggs laid in ovitraps set monthly both indoors and outdoors in urban and rural areas. the populations predominantly consisted of the dark type form, regardless of macrohabitats (urban vs. rural), microhabitats (indoor vs. outdoor) or seasons (dry vs. rainy). among 6,003 specimens, no individuals had pale-scales continuing from the tergal base to its apex on the third ... | 1989 | 2614402 |
| ovitrap surveys of dengue vector mosquitoes in chiang mai, northern thailand: seasonal shifts in relative abundance of aedes albopictus and ae. aegypti. | aedes aegypti (l.) and aedes albopictus (skuse) were surveyed using ovitraps in residential areas in chiang mai, northern thailand. egg populations (both species inclusive) remained low in the dry season, but increased/decreased exponentially during the first/latter half of the rainy season, respectively. this seasonal pattern was similar to the seasonal distribution of dengue haemorrhagic fever cases in the area. during the dry season (november-march) ae.aegypti was dominant in urban and indoor ... | 1988 | 2980189 |
| genetic structure of aedes aegypti populations in chiang mai (thailand) and relation with dengue transmission. | we analysed the population genetic structure and differentiation regarding vector competence for a dengue virus of 15 aedes aegypti samples collected from chiang mai in northern thailand. based on polymorphism of 10 isoenzyme loci, genetic differentiation was confirmed among samples collected in different subdistricts (high fst values and p < 0.05). based on infection rate for a dengue 2 virus, susceptibilities were similar in mosquitoes collected in san nuea subdistrict and in choeng doi subdis ... | 2002 | 12358622 |
| genetic structure of aedes aegypti populations in thailand using mitochondrial dna. | a hierarchical population genetic study was conducted among 19 aedes aegypti populations in thailand from chiang mai in the north to songkhla province in the south. single-strand conformation polymorphism analysis was used to examine variation in a 359-basepair region of the nadh dehydrogenase subunit 4 mitochondrial dna gene (nd4). seven haplotypes were detected in two lineages previously identified in nd4 haplotypes from north america. gene flow estimates and highly significant variation among ... | 2005 | 15827282 |
| essential oils as potential adulticides against two populations of aedes aegypti, the laboratory and natural field strains, in chiang mai province, northern thailand. | essential oils derived from five plant species, celery (apium graveolens), caraway (carum carvi), zedoary (curcuma zedoaria), long pepper (piper longum), and chinese star anise (illicium verum), were subjected to investigation of adulticidal activity against mosquito vectors. two populations of aedes aegypti, the laboratory and natural field strains, collected in chiang mai province, northern thailand were tested in pyrethroid-susceptibility bioassays. the results revealed that the natural field ... | 2006 | 16738885 |
| the effect of host type on movement patterns of aedes aegypti (diptera: culicidae) into and out of experimental huts in thailand. | flight behavior studies were carried out from december 2004 through february 2005 at two sites in thailand to compare the movement patterns of aedes aegypti into and out of experimental huts baited with a human host, dog host, or without a host using a mark-release-recapture study design. studies were conducted in isolated villages of kanchanaburi and chiang mai provinces, thailand. in the presence of a human host only 4.9% (39/800) of the ae. aegypti females departed the hut as compared to 46.5 ... | 2006 | 17249349 |
| a survey of dengue viral infection in aedes aegypti and aedes albopictus from re-epidemic areas in the north of thailand using nucleic acid sequence based amplification assay. | immature stages of aedes aegypti and ae. albopictus were collected from 17 dengue re-epidemic areas in chiang mai and lampang provinces, in the north of thailand. they were reared to adults and tested for dengue viral rna by a nucleic acid sequence based amplification assay (nasba). of a total of 9,825 ae. aegypti and 150 ae. albopictus examined, none of them were found positive for the virus, suggesting that transovarial transmission may be very low in the vector populations and may not play a ... | 2007 | 17877218 |