Dengue fever (DF), one of the most important emerging arboviral diseases, is transmitted through the bite of container breeding mosquitoes Aedes aegypti and Aedes albopictus. A household entomological survey was conducted in Dhaka from August through October 2000 to inspect water-holding containers in indoor, outdoor, and rooftop locations for Aedes larvae. The objective of this study was to determine mosquito productivity of each container type and to identify some risk factors of households infested with Aedes larvae. Of 9,222 households inspected, 1,306 (14.2%) were positive for Aedes larvae. Of 38,777 wet containers examined, 2,272 (5.8%) were infested with Aedes larvae. Containers used to hold water, such as earthen jars, tanks, and drums were the most common containers for larval breeding. Tires in outdoor and rooftop locations of the households were also important for larval breeding. Although present in abundance, buckets were of less importance. Factors such as independent household, presence of a water storage system in the house, and fully/partly shaded outdoors were found to be significantly associated with household infestation of Aedes larvae. Identification and subsequent elimination of the most productive containers in a given area may potentially reduce mosquito density to below a level at which dengue transmission may be halted.

Dengue fever (DF), one of the mostimportant emerging arboviral diseases, is transmitted through the bite ofcontainer breeding mosquitoes Aedesaegypti and Aedes albopictus. Ahousehold entomological survey was conducted in Dhaka from August throughOctober 2000 to inspect water-holding containers in indoor, outdoor, androoftop for Aedes larvae. Theobjective of this study was to determine mosquito productivity of eachcontainer type and to identify some risk factors of the households to beinfested with Aedes larvae. Of 9222 households inspected, 1306(14.2%) were positive for Aedes larvae. Of 38 777wet containers examined, 2272 (5.8%)were infested with Aedes larvae. Containers used for reserving water,such as earthen jars, tanks, and drums were the most essential containers forlarval breeding. Tires in outdoor and rooftop of the households were alsoimportant for larval breeding. Although present in abundant, less importancewas indicated for buckets. Independent household, having water storage systemin the house, and having fully/partly shaded outdoor premise were foundsignificantly associated with household infestation of Aedes larvae. Identification and subsequent elimination of the most productive containers ina given area may potentially reduce mosquito density below a level at whichdengue transmission may be halted.

From 1986 to 1991, 49 malignancies were found in sonographic examination of 53, 788 subjects carried out by the Kumamoto Prefectual Welfare Federation of Agricultural Cooperatives. The cases were composed of 12 hepatocellular carcinomas, 11 metastatic liver tumors, 11 renal cell carcinomas, 6 gall bladder carcinomas, 3 gastric carcinomas and 6 ether malignancies including metastatic pancreas tumors and ovarian tumors. A follow-up survey was made in 37 cases. All the case of renal cell carcinoma were found in an early stage and showed the best prognosis; the 2-year survival rate was 100%(n=7). In hepatocellular carcinomas 1-year and 2-year survival rates were 85% and 33%, respectively. Eight of 11 metastatic liver tumors were f rom gastrointestinal malignancies, and prognosis was poor; 1-and 2-year survival rates were 44% and 37%, respectively. Gastric carcinomas were found with lymphadenopathy or the thickening of the gastric wall, so prognosis was quite poor. Abdominal sonography has proved to be a very convenient and safe procedure to find out malignancies in the early stage. In detected (asymptomatic) cases of renal cell carcinoma, prognosis was excellent.