[Study on the characteristics of Tsutsugamushi disease in the epidemic areas of south islands in China].

Objective: To study the increasing incidence and the characteristics of Tsutsugamushi disease in the areas of Nan Peng Lie islands, Nan Ao island, Wan Shan archipelago, Nao Zhou island and Lei Zhou peninsula, located in the southern part of China and to develop strategies for preventive measures.

Methods: Both epidemiological investigation, isolation and gene identification of Orientia tsutsugamushi, as well as pilot preventive measures were carried out.

Results: These islands belonged to the epidemic area of south subtropical zone of Tsutsugamushi disease.

[Development and application of geographic information system of Aedes vector in Chaozhou city, Guangdong province].

Objective: To explore the spatial distribution character of dengue fever and the change of Aedes' population, so as to provide macroscopical decision-making evidences of prevention and supervision on dengue fever.

Methods: (1) Collecting data on morbidity of dengue and supervision on vector's population in the corresponding period. (2) Drawing digitized map of Chaozhou in scale of 1:50,000, including elements of boundary, residential areas, road and traffic, altitude, water systems etc.

[Study on the distribution of malaria in Hainan province through spatial local interpolation technique].

Objective: To explore the spatial distribution of malaria in Hainan province.

Methods: Maps of spatial distribution on malaria incidence in Hainan province from 1995 to 1999 were produced, using a spatial local interpolation technique in the ArcGIS 8.1 software.