The study was conducted in Khanh Trung commune, Khanh Vinh district of Khanh Hoa province to assess the mosquito infection two years after DEC administration. Seventeen species of mosquito belonging to 5 genera have been found of which the main vector Wuchereria bancrofti was predominant. Indoor collection of Culex quinquefasdatus at daytime and nighttime was 3.5 and 2.3 individuals/house, respectively. Cx. vishnui was mainly found on the cattle sheds with an average density of 4.6 individuals/shed. A total of 578 mosquitoes of five species (Cx. quinqllefasciatus, An. vaglls, Cx. tritaeniorhynchus, Cx. vislznui, Cx. fuscocephalus) were dissected. None of them were positive with microfilaria.
Culicidae ; Albendazole

100% of mosquito batches were collapsed after 30 minutes exposing to test paper and dead after 24 hours following up. This indicates that the mosquito in test places is very sensitive to permethrin and lambda cyhalothrin and these chemicals are effective in killing mosquito during outbreaks. The number of locals where involved in evaluating the sensitivity of mosquito to chemicals are increasing. These are provinces where the insects surveillance systems are available.
Pesticides ; Culicidae

Aedes aegypti mosquitoes had been collected at field of some Northern provinces between 2001 and 2004 for studies of their susceptibility to insecticides. It was seen that: all of tested mosquitoes dropped immediately 100% and 100% killed after 24 hours. The results showed that all tested mosquitoes were highly susceptible to insecticides, such as permethrin, lambda cyhalothrin, and malathion from 2001-2004 in Northern region. The provinces participate in the test was up fro 5-7. Using the insecticides to kill Aedes aegypti by ULV spraying was effective in Northern provinces in Vietnam. It is adviced to send mosquitoes and lavae in June and July when the density of mosquitoes and lavae is high. Therefore, expanding studies to other provinces throughout the country to identify susceptibility of Aedes aegypti to insecticides is very necessary for Dengue Hemorrhagic Fever vector control.
Culicidae ; Insecticides

The spatial repellency with metofluthrin impregnated strips were hung in 15 households at Do Son, Hai Phong. The results showed that the density of mosquitoes reduced by 18 weeks after hanging strips. People agree that this was one of the safe, effective and simple method to control mosquitoes.
Culicidae ; Cyclopropanes

An evaluation of the current coverage and diminished rate of mosquito nets usage for malaria control plays an important role in malaria control planning. A survery was carried out between 1995 and 2003 in 15 hamlets of five communes of 3 malaria endemic districts in Thua Thien – Hue province. A high rate of bed-net usage was found in the surveyed hamlets. In average, the coverage reached the rate of 2.0 ± 0.3% nets per person. However a considerable rate of damaged nets (4.7 ± 1.2%) was also recorded in the surveys. Further surveys and studies should be conducted to determine the ways the bed-nets go down and get diminished for planning of more appropriate malaria control measures
Malaria ; Culicidae ; Mosquito Control

A research was conducted in 2001 and 2002 to evaluate the efficacy of remaining spray by using Permethrin 50EC to kill both kinds of vectors: Xenopsylla cheopis and Anopheles minimus, responsible for plague and malaria transmission, respectively. The results showed that Permethrin 50EC at the concentration of 0.5g/m2 was highly effective to kill Xenopsylla cheopis and Anopheles minimus and remained effective for 4 months
Anopheles ; Permethrin ; Culicidae

In September – December 2001 period, from 4987 female Culex mosquitoes collected in Cat Que commune, Hoai Duc district, Ha Tay province, 4 viral species were isolated by clone C6/36 cells of Vero and Aedes albopictus. Among them, 2 species were alpha virus, 01VN61 virus was isolated from Culex tritaeniorhynchus and 01VN62 virus from Culex gelidus, both strains were adapted to 1-2 days age mice. By sequencing technique on E1 gene and 3 NCR gene area, 01VN62 virus was identified as Safiyama virus, a virus of alpha virus
Alphavirus ; Culicidae ; Culex

Evaluation of effectiveness of house spraying with Ale 10SC/m2 in malaria mosquitoe prevention by testing bioassay and etomological indicators as well as side effects in the community in implemented area from 11/2003-11/2004 at Quyet Chien commune, Tan Lac District, Hoa Binh province shows that using Ale 10SC spraying with 30mm/m2 with 6 months of residual on wooden and brick wall and the mosquitoe death rate is 51.3-52.6%. Ale 10SC spraying decreased the density of An.minimus domestically daytime and seeking blood. Ale 10SC spraying with 30mg/m2 in malaria transmitted mosquitoes does not have side effects on people using it directly and the community
Malaria ; Culicidae ; Pyrethrins

Filariasis mosquitoes and susceptibility of Cx. quinquefasciatus and Cx. vishnui to insecticides were investigated in September 2004 and May 2005 in Khanh Trung commune, Khanh Vinh district, Khanh Hoa province. Twenty two mosquito species belonging to 5 genus have been found, of which the primary vector of W.bancrofti filariasis was captured with a high density, while vectors of B.malayi was found in a lower density. A total of 805 mosquitoes of 6 species (An.barbumbrosus, An. vagus, Cx.fuscocephala, Cx.quinquefasciatus, Cx.tritaeniorhynchus and Cx. vishnui) were dissected. None of them were positive with microfilaria. Cx.quinquefasciatus was found highly resistant to lambdacyhalothrin, alphacypermethrin and malathion with the mortalities of 11 %, 21%, and 60%, respectively. Similarly, the mortalities of Cx.vishnui were 19.76%, 23.83% and 13%-17%, respectively.
Filariasis ; Culicidae ; Malaria

A product with 15% DEET gave an overall bite protection of 85%, without evidence for a diminishing effect through the night. When mosquitoes had a choice at one site between people using repellent or not, the repellent had most effect (88% protection with choice and 57% - 79% without choice). A product containing 27% DEET worked significantly better with 93% overall bite protection. The 15% product is locally available, cheap (0.8 US$ for a flacon of 75ml which lasted 30 person-nights) and in the opinion of the capturers well compatible
Culicidae ; Malaria ; Forestry