Objective To investigate the resistance levels of Musca domestica to four commonly used insecticides in the special places such as landfill and meat processing plant in Guangdong province, China. Methods M. domestica larvae were collected in the wild breeding habitats, and topical application was used to determine the median lethal doses (LD₅₀) of permethrin, deltamethrin, beta-cypermethrin, and DDVP for M. domestica. The experimental data were statistically analyzed by extremum method. Results The LD50 of permethrin, deltamethrin, beta-cypermethrin, and DDVP were 13.7179, 3.5971, 5.5982, and 0.7704 μg/insect, respectively, for M. domestica in the landfill and were 1.0999, 0.7278, 8.3314, and 0.5322 μg/insect, respectively, for M. domestica in the meat processing plant. The resistance ratios were 58-2525, increased 1-103 times compared with those in 1996 and increased 2-1383 times compared with those in 1991. The resistance of M. domestica to permethrin, deltamethrin, and DDVP was higher in the landfill than in the meat processing plant. Conclusion M. domestica develops high resistance to some insecticides in the special places in Guangdong province, and the resistance to pyrethroid increases rapidly. Comprehensive management strategies and proper insecticide use should be adopted to control M. domestica in the special places such as landfill and meat processing plant.

Objective To analyze the association between prevalence of Chikungunya fever and Mosq-ovitrap index (MOI) and to investigate the infection with Chikungunya virus (CHIKV) in larval and adult Aedes albopictus. Methods Mosquitoes were collected by mosq-ovitrap and the mosquito density was also determined by Breteau index (BI) during Chikungunya fever outbreak. CHIKV was detected in the Ae. albopictus samples collected in the field by real-time fluorescence PCR and cell culture for isolation. Results Comprehensive emergency control measures were taken for anti-mosquito purpose after the confirmation of Chikungunya fever outbreak. After one week of ergency management, the epidemic situation was effectively controlled, as shown by the fact that both MOI and BI were lower than 5. The collected mosquito samples were divided into 27 groups according to collection time and location, and then CHIKV detection was performed. The results showed that all adult mosquito samples were virus negative, and 3 larval mosquito samples soaked in alcohol were questionably positive, counting for 12.5% of all 24 larval mosquito samples. There were only negative results in the virus detection based on cell culture and isolation. A total of 253 cases were reported in the community with Chikungunya fever outbreak, and the emergency control measures lasted for 22 days.Conclusion As for responding to Chikungunya fever outbreak, mosq-ovitrap is safe, effective, and easy-to-operate for indicating emergency mosquito control, especially for evaluating control efficacy and detecting virus in adult mosquitoes. The infection rate and transmission rate of CHIKV in Ae. albopictus during Chikungunya fever outbreak deserve further study in the future.

Objective To determine the characteristics and dynamics of mosquito population during the process of rapid urbanization, and to identify the relationships between the dynamic of main vectors and rapid urbanization. Methods The mosquito density was investigated for the past four years using the human-bait method. Results Five species of mosquito were captured, including Culex tritaeniorhynchus, Culex pipiens quinquefasciatus, Anopheles sinensis, Aedes albopictus, and Armigeres subalbatus. Cx. pipiens quinquefasciatus was predominant (92.27%), followed by Ar. subalbatus (3.98%). The proportions of Ae. albopictus and Cx. tritaeniorhynchus were relatively small, accounting for 1.62% each. The smallest was An. sinensis (0.51%). During a four-year study period, significant changes had taken place in the proportions of mosquito populations by comparison among the data in 2006, 2008 and 2009. The population of Cx. pipiens quinquefasciatus decreased while increased of that of Ae. albopictus. An. sinensis gradually disappeared as the time elapsed. The poplation of Cx. tritaeniorhynchus fluctuated largely in the study periods. In the evening, varieties of mosquito species showed distinct activity patterns. The biting time of Cx. pipiens quinquefasciatus and Cx. tritaeniorhynchus was from 19: 00 to 22: 00 in the evening with a peak after 21: 00. Ae. albopictus could be caught all the night with the main peak before 20: 00. A similar activity pattern was observed from Ar. subalbatus and Ae. albopictus. Conclusion During the process of rapid urbanization, the population of the dengue vector, Ae. albopictus, increased gradually. The population of the Japanese encephalitis vector, Cx. tritaeniorhynchus, fluctuated greatly in different years. However, the malaria vector, An. sinensis, eventually was not found. Thus, we propose that the surveillance and control of Ae. albopictus and Cx. tritaeniorhynchus should be strengthened during the process of urbanization.

　　【Abstract】　Objective　To test the efficacy of four kinds of electric liquid repellents (A 0.12% dimefluthrin, B 0.17% dimefluthrin, C 0.86% transfluthrin, D 0.86% prallethrin) for the Japanese encephalitis(JE) vectors in the field. Methods　The landing count method was used to the investigation of mosquito density before and after treatment by electric liquid repellent. Results　The main species caught in the field were Culex pipiens quinquefasciatus and Cx. tritaeniorhynchus, which were the JE vector. Only  sample  A  reached ＞80%  population  reduction  of  Cx. tritaeniorhynchus. Both sample B, C and D caused ＜80% population reduction of Cx. tritaeniorhynchus. Both sample A, C and D caused ＞80% population reduction. However, only sample B led to 70%-80% population reduction. Conclusion　The tests suggest that four samples have a good repellent effect on mosquito, but the efficacy of sample B is less than that of sample A, C and D. There are different for the control efficacy of different electric liquid repellent in the lab and the field.

　　【Abstract】　Objective　To evaluate the surveillance effect of Mosq?ovitrap to Aedes in the littoral areas with the high mosquito density. Methods　Three or four Mosq?ovitraps were set in each household selected randomly from every 5 families. At the same time, the positive rate of the containers was investigated inside and outside of the household. Results　A total of 1027 Mosq?ovitraps were set, and 43 Mosq?ovitraps were positive among 939 Mosq?ovitraps recovered effectively. Mosquito and oviposition positive index(MOI) was 4.6. There were 217 positive standing wasters among 324 households investigated, and the Breteau Index was 67.0, which was much higher than MOI. There was no significant correlation between them （r＝0.449，P＞0.05）. Conclusion　The environmental hygiene condition has an important effect on the monitoring results of Mosq?ovitrap. It still needs to further study that how to raise the catching ability of Mosq?ovitrap to mosquitoes and apply it to the mosquitoes surveillance in the areas with high mosquito density.

　　【Abstract】　Objective　To develop a system of stepwise response for risk categories for dengue fever in China. Methods According to ecological features of Aedes albopictus, establish the method of mosquito and oviposition trap and compare the relationship of the mosquito and oviposition positive index （MOI） and the Breteau index （BI） or the Ovitrap index obtained from the traditional dengue fever vectors surveillance. Develop an epidemic forecast and phased response system for dengue fever control and prevention with reference to other correlative grade control system for dengue or other vector?borne disease, combined with the actual application of mosquito and oviposition trap in the vector surveillance. Results　The MOI could be classified into 4 levels, below 5, 5-20, 20-40, and ＞40 respectively. Stepwise response for risk categories for dengue fever were divided into 4 levels according to the levels of MOI, seasonal character, virus infection rates in mosquitoes and the result of human cases surveillance. Conclusion　The MOI is less than 5, which suggestes the control of dengue fever is very effective. However, the risk categories and its response index still need further study and verify in the practical application.

　　【Abstract】　Objective　A field study was carried out in a restaurant in the south of China to investigate the blood sources affected Japanese encephalitis （JE） vectors Culex tritaeniorhynchus and Cx.pipiens quinquefasciatus indoor abundance. Methods　Vector density was investigated by human?leg capture technique. Results　In the dinning room adjacent to deer blood resource, Cx.tritaeniorhynchus was the dominant specie（74.80% of total number） and the minor vector was Cx.pipiens quinquefasciatus （21.14%）. However, in the restroom where the mosquitoes could only access to human blood,  Cx.pipiens quinquefasciatus accounted for 60.28% and that of Cx.tritaeniorhynchus was 36.62%（n＝845）. The density of Cx.tritaeniorhynchus in restroom was higher than that in the dinning room （df＝1, χ2＝5.32，P＜0.05, n＝676）. However, the density of Cx.pipiens quinquefasciatus in the dinning room was higher than that in the restroom（df＝1, χ2＝268.45， P＜0.001, n＝611）. Conclusion　The results showed that the blood resources influenced the JE vector spatial abundance. The abundance of Cx.tritaeniorhynchus or Cx.pipiens quinquefasciatus was affected by the animal blood or the human blood.

Objective To investigate the breeding characteristics of Aedes albopictus in urbanization residential area,which should provide the basis for the control of Ae.albopictus. Methods The study was carried out in the village of Jieyang city and high-urbanization downtown of Foshan from March 2004 to November 2005. Water containers were detected in and around one household which was randomly selected every 5 households. The data were analyzed by software SPSS 11.0. Results Of 5635 possible breeding sites in 7470 houses investigated, 502(6.72%) were positive. In the village of Jieyang,the major breeding containers included unused container (jars, bottles and tins, etc.) and water reservoir receptacles with the positive constitute ratio of 64.98% and 18.77% respectively. The positive constitute ratio of unused containers reached the maximum in September every year. But in residential area of Foshan city, the major breeding containers were made up of water vases in which the flowers and plants grow and unused containera, and the positive constitute ratio of them were 45.52% and 33.79% respectively. The positive constitute ratio of unused containers was in the peak from July to September, and that in miniascape and water plant was the highest in 2004 and May 2005 with the value of 75.00%. But the result was zero after May 2005. Conclusion There were different among the breeding sites in different residential area, which varied with season. The breeding containers in increasing urbanization cities were mainly miniascape, water plant and unused containers, but in low urbanization village, the breeding sites were mainly the unused containers and water reservoir receptacle.

Objective Find out the mosquito species and density in a military camp on Beijing suburb and search the new method of mosquito monitoring. Methods CO₂ trapping lamp method, comparing with mosquito net trapping method at the same time. Results By CO2 trapping lamp method, total 676 mosquitoes were trapped, divided into 2 genus and 2 species. 95.71% of the total wereCulex pipiens pallens, 4.29% were Aedes albopictus. Most of Culex pipiens pallens were trapped in work area and grove in the camp before midnight, and most of Aedes albopictus were trapped in life area and grove before dawn. By mosquito net trapping method, tatal 178 mosquitoes(within 2 h) were trapped, 83.70% of the total were Culex pipiens pallens,and 16.30% were Aedes albopictus. Conclusion Preliminary research on the mosquito species and density in a military camp on Beijing suburb showed that the CO₂ trapping lamp method is a reliable method of mosquito monitoring.

Objective In order to test the efficacy of four kinds of mosquito coils in the field,and to investigate the efficacy tests and evaluation methods for different kinds of mosquito coils.Methods Compare with density reduction by the bite counts based on pre-and post-treatment using human-leg catch technique.Results The main species which was caught in the trial field was Culex pipiens quinquefasciatus and decreased the peak of bites period was from 22:00 to 23:00 in the evening.Coil A and D caused 88.2%,90.5% population,respectively.However,coil B and C led 72.5%,78.1% population reduction,respectively.Conclusion The tests suggested that four coils had a good effect on prevention from the bites of the mosquito,yet,the insecticide efficacies of coil A and D are better than that of coil B and C.Discussion: Pre-trial is very essential for the efficacy tests in the field trial.Simulating field test for indoor insecticidal efficacy should be adopted to correct or reduce the experiment error.

Objective The inquisitions conducted were to know the clinic symptoms,treatment of irritability shock case bitten by red imported fire ant,Solenopsis invicta and to know the relative environmental factors for this insect existing,so as to provide evidence for such cases treat ment.Methods We visited the director doctor and the patient,analysed his medical record,investigated the local field where the patient was hurt.Results The patient was diagnosed be irritability shock caused by ant stinging and the patient was cured by antiallergic treatment two hours later.The breeding site of the red imported fire was found in the local field where the patient was hurt.Conclusion A sting of the red imported fire ant could lead to the anaphy lactic shock.