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

Common insecticides were tested in Laboratory of Insecticide, National Institute of Hygiene and Epidemiology in order to select the highest efficacy of insecticides which remained susceptible in killing cockroach in train’s carriages. The study results showed that the number of collected cockroach populations reduced sharply at different time spans of 2 hours, 1 week, 2 weeks and 4 weeks after spraying
Insecticides ; Cockroaches

In recent years, chlorfenapyr poisoning has gradually increased in clinical practice, but the case fatality rate remains high. At present, the research on its poisoning mechanism and clinical characteristics is limited, and there is no effective treatment. In order to summarize the clinical characteristics of chlorfenapyr poisoning, in order to guide the clinical treatment, this article reported 2 cases of acute chlorfenayr poisoning and 21 cases of literature review, and summarized the clinical characteristics of chlorfenapyr poisoning.Most of the symptoms of gastrointestinal symptoms, profuse sweating, high fever, and changes in consciousness after chlorfenapyr poisoning, and delayed exacerbations are common, which can involve multiple organ systems such as the central nervous system, providing a basis for clinical diagnosis and treatment.
Insecticides ; Pyrethrins

Although the morbidity was sharply reduced in the last few years with the prevalence per 1000 population of 7.02%o in 1999, 4.37 %o in 2000…and the rate of population was protected by insecticide remained annual. The rate of population was protected by insecticide/population of malaria area was 58.6%o in 1999, 86.3%o in 2000. However, malaria has been increased by 31.6% during the first 9 months of 2003 as compared to 2002. Positive slide rate increased by 47% and parasite positive per patients increased by 64%. It is suggested that the activities for roll back malaria in the recent years have not been effective enough in accordance to the planned targets. It can also be attributable to the way of life of high risk groups such as swidden field sleeping, uncontrolled migration, the unsatisfactory coverage of insecticide protected people and poor management by local health
Malaria ; Insecticides ; diagnosis ; epidemiology

A survey was conducted during 2001-2003 year period in NuocNhi village, PhuKhanh commune , KhanhVinh district, KhanhHoa province in order to evaluate the malaria morbidity three years after interruption of using permethrine insecticide impregnanted bednet In this period, the new incidence in various age groups, including 2-9 years old of age group, was similar with that of 3 previous years when this impregnanted bednet had been used, from the year 2000 to 2003, only 5 cases of splenomegaly, 1st level splenomegaly were reported, even in the 2-9 years old of age group.Splenomegaly and anemia frequencies trended to reduce.The density of Anopheles population in general and of An. dirus in particular trended to enhance. In the year 2001,An.dirus density increased by 2 folds in comparing with the mean of that of previous years when insecticide impregnanted bednet had been used, but this density was as low as15,7% of that before this use. There was no report on oocystes and sporozoites
Malaria ; epidemiology ; Insecticides ;

By synthesizing and analysing poisoning analyses from 1996 to 2000 at Hai Phong Viet Tiep Hospital found an increasing incidence of insecticide and raticide poisons. Incidence of insecticide and raticide was 21.18% in 1996, in which raticide rate was 5.08%, raticide rate was 20.11% in 2000, there were a noticeable rate of raticide poisons without knowing the origin of the raticide in chinese (called chinese raticide). The poisoning analyses played a considerable role in giving first aid for poisons in general and for insecticide and raticide poisons in particilar
Insecticides ; Poisons ; Epidemiology

The study was carried out in on 100 white mice, divided in two groups, 50 mice for each one. The experimental group was exposed to Bassa 50EC with dose of 30mg/kg body weight during 60 days. The other 50 mice were taken distilled water with a similar dose and time. The results were that erythrocytes, leucocytes, hemoglobin in blood were decreased after Bassa exposing to mice (neutrocyte was decreased and lymphocyte was increased) clearly on the 15th to 45th day after exposing to Bassa with (P<0.05 - 0.001). The changes were not equal to the primitive value on the 60th day.
Insecticides ; Hemorrhage ; Animals

Studying the susceptibility of Aedes aegypti to some insecticides in 22 places of 11 provinces and cities in 4 different regions of Vietnam. Results: Ae. aegypti mosquito was still susceptible to Malathion but resistant to DDT in most of studied places. Ae. aegypti was susceptible to insecticides of perythroid group (such as permethrine, lambda-cyhalothrine, deltamethrine, and alphamethrine) in many places in Northern and Central Vietnam, while it was resistant in Southern Vietnam and the Central Highlands. Ae. aegypti was also resistant highly and widely to etofenprox
Insecticides ; Mosquito Control ; chemistry

From Sept.2001 to Oct.2002, in diverse studied and control villages of 2 communes Iakor and Iatiem of ChuSe district, GiaLai province, an investigation was performed. In Iakor, 50mg/m2 solfac EW050 soaked mosquito bednets, and in Iatiem, 50mg/m2 solfac WP10 maintaining sprayed mosquito bednets were supplied for use. On the wooden or bamboo wall surface, insecticide effect was maintained for 6 months, on brick wall for 1month and on soaked net for 11 months. In the permanent resident sites of mosquitoes, no An. minimus and An.dirus, main vectors, were detected after the trial, but some other such as An.aconitus and An. jeyporiensis were still detected
Malaria ; Culicidae ; Insecticides

Study on filariaisis mosquitoes and susceptibility of Cx.quinquefasciatus to some insecticides were conducted in September 2003 at Khanh Trung commune, Khanh Vinh district, Khanh Hoa province. The results showed that: 16 mosquito species of 5 races had been found, in which mosquitoes were main vectors of Wuchereria bancrofti (Cx quinquefasciatus, Cx.vishnui) had high density, while the vectors of Brugia malayi (Ma.uniformis) had very low density. 227 mosquitoes of 4 species (An.barbumborsus, Cx quinquefasciatus, Cx.vishnui, Cx.tritaeniorhynchus) were dissected, none of them were positive with microfilaria. Cx. quinquefasciatus was found to be highly resistant to malathion, lambda-cyhalothrin and alpha-cypermethrin with mortalities of 60,5%, 11% and 21%, respectively
mosquitoes ; Filariasis ; epidemiology ; Insecticides