| 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 |
| 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 |
| a seroepidemiological study of japanese encephalitis and dengue virus infections in the chiang mai area, thailand. | as part of a virological and epidemiological survey of encephalitis in the chiang mai area, the neutralizing (n) antibody levels of healthy persons to japanese encephalitis (je) and dengue (den) type 1-4 viruses were examined. a total of 985 blood samples was collected by the filter paper method from subjects of nine age groups in five districts, four (pasang, sarapee, doi saket and mae taeng) in the chiang mai valley and one (fang) in another valley separated by several ranges of mountains from ... | 1984 | 6091618 |
| flavivirus infections in chiang mai area, thailand, in 1982. | infection by je virus still constitutes major cause of encephalitis in chiang mai area, although some cases of possible dengue encephalopathy were observed. in spite of many apparent encephalitis cases, infection of vector mosquitoes by je virus was not demonstrated. virus isolation from hospitalized patients showed that the principal type of dengue virus circulating in chiang mai in 1982 was type 1 virus. seroepidemiological survey on healthy humans indicated that the northern part of chiang ma ... | 1983 | 6324386 |
| studies on serological cross-reaction in sequential flavivirus infections. | acute- and convalescent-phase sera from patients with dengue (den) hemorrhagic fever (dhf) and japanese encephalitis (je) that contained pre-existing flavivirus antibodies were tested for cross-reacting antibodies to den, je and yellow fever (yf) viruses by a neutralization (n) test. a fourfold or greater rise in n antibody titer in the convalescent-phase was considered significant. of 39 dhf cases, obtained at chiang mai university hospital, thailand, 15 (38.5%) showed a rise in den antibody ti ... | 1994 | 7723688 |
| primary sequence of the envelope glycoprotein of a dengue type 2 virus isolated from patient with dengue hemorrhagic fever and encephalopathy. | dengue viruses exist in nature as a collection of highly similar but not identical members (quasispecies). in order to correlate the presence of viral quasispecies with rare occurrence of unusual clinical manifestations in dengue-infected individuals, a dengue type 2 virus was isolated from the peripheral blood of a 12-year-old boy who presented with fever, headache, drowsiness and tonic seizure of the left arm, and subsequently manifested symptoms and signs of dengue hemorrhagic fever. analysis ... | 1996 | 9279981 |
| 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 |
| 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 |
| a novel influenza a h1n1 clinical manifestations in patients at chiang mai university hospital. | to describe the clinical manifestations of patients affected with a novel influenza a (h1n1 2009) during the pandemic. | 2011 | 21863671 |
| temporal frequency of knockdown resistance mutations, f1534c and v1016g, in aedes aegypti in chiang mai city, thailand and the impact of the mutations on the efficiency of thermal fogging spray with pyrethroids. | in thailand, control of dengue outbreaks is currently attained by the use of space sprays, particularly thermal fogging using pyrethroids, with the aim of killing infected aedes mosquito vectors in epidemic areas. however, the principal dengue vector, aedes aegypti, is resistant to pyrethroids conferred mainly by mutations in the voltage-gated sodium channel gene, f1534c and v1016g, termed knockdown resistance (kdr). the objectives of this study were to determine the temporal frequencies of f153 ... | 2016 | 27325294 |