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PubMed2006

Demographic and spatial analysis of West Nile virus and St. Louis encephalitis in Houston, Texas.

This descriptive prevalence study describes the relationships between mosquito density and the presence of arboviruses (in mosquitoes and humans) with various socioeconomic and environmental factors present near the time of teh arbovirus outbreak in Harris County, Texas, in 2002. This study suggests that mosquito density increased if the trap was located in an area with a large number of containers that may inadvertently retain rainwater (P = 0.056). When considering only virus-positive mosquitoes, significant relationships were observed if the trap was located near waste materials (P < 0.001) or near containers that may inadvertently retain rainwater (P = 0.037). Furthermore, the presence of arbovirus activity (in mosquitoes or humans) in a geographic area tended to be associated with the socioeconomic status of the local community. Although the results of socioeconomic comparisons were not significant, they were suggestive, demonstrating an interesting trend. Compared with communities where virus activity was not observed, the socioeconomic status of the arbovirus-positive community was consistently lower. Specifically, results showed that the populations residing in virus-positive census tracts attained less education, earned less income per household, and were more likely to be below the poverty level. In addition, this study found that virus-positive mosquitoes were randomly distributed throughout the study area, whereas severe human infection cases were clustered. Based on the results of this study, we conclude that the health outcome of a local community as it relates to West Nile virus and St. Louis encephalitis is dependent on many factors, including eh socioeconomic and environmental characteristics of the community.

Animals↗
PubMed2006

Spatial analysis of sleeping sickness, southeastern Uganda, 1970-2003.

Sleeping sickness re-emerged in southeastern Uganda in the 1970s and remains a public health problem. It has continued to spread north into new districts, and gaps remain in the understanding of the causes of its spread and distribution. We report the distribution and magnitude of sleeping sickness in southeastern Uganda from 1970 to 2003. Data were collected from records of the Ugandan Ministry of Health, individual sleeping sickness treatment centers, and interviews with public health officials. Data were used to develop incidence maps over time, conduct space-time cluster detection analyses, and develop a velocity vector map to visualize spread of sleeping sickness over time in southeastern Uganda. Results show rapid propagation of sleeping sickness from its epicenter in southern Iganga District and its spread north into new districts and foci.

Animals↗
PubMed2005

[Spatial analysis of mortality caused by malignant tumors, especially by digestive system tumors, using empirical Bayes estimates in Fejér County, Hungary].

General practitioners in the vicinity of Lake Velencei in Fejér County, Hungary, have reported an unusual pattern of recent cancer mortality. Our aim was to clarify whether the presumed mortality cluster is epidemiologically justified; whether it is restricted to the locations in question or also appears elsewhere in the county; and if it is associated with some particular disease group. County mortality from malignancies of the digestive system, other malignancies, and all other causes for the period 1994 to 1999 was analyzed in 15- to 64-year-old men and women, using conventional standardized mortality ratios and empirical Bayes estimates. A continuous surface was interpolated from settlement level data for mortality maps. A mortality cluster from men's digestive cancers is apparent north and east of Lake Velencei and also elsewhere in the county. Differences from the country average in the frequency of males' deaths from other malignancies are fairly limited. A number of problematic areas in men's mortality from other causes are identifiable, including some of the settlements under the primary focus. Women's digestive tract cancer mortality in the area of the men's cluster near Lake Velencei is below the national average. There are almost no differences from the country level in women's deaths from other malignancies. Female mortality from all other causes shows remarkable elevations in the south of the county. Our results suggest the possible role of geographically localized exposures. Men's high mortality from digestive tract cancers is a problem affecting a considerable area of the county, necessitating further investigation. Continued search for causes is also warranted by some estimates of exceptionally high death rates in women from causes other than malignancies.

Adolescent↗
PubMed2000

[The spread of the AIDS epidemic in Brazil from 1987 to 1996: a spatial analysis].

Mean AIDS incidence rates were calculated for three time periods, 1987-89, 1990-92, and 1993-96, using reported adult AIDS cases by county. The analysis included the following variables: "population of counties for resident AIDS cases"; "proportion of population residing in urban areas", and "concentration of poverty", stratifying by gender and exposure categories. The Southeast region has experienced the lowest increase, contrasting with the steep rise observed in the North and South between the second and third study periods. Comparing variations in incidence rates from 1990-92 and 1993-96 by region or population, the greatest increase was among women. In the larger cities, AIDS cases among "homo/bisexual men" predominate, although the proportion of cases among men who have sex with men has decreased as heterosexual cases have undergone a continuous increase. IDUs have been the core stratum in medium-sized counties. For the smallest counties, heterosexual transmission has been the basic element in local dynamics. Even though AIDS is still an urban phenomenon in Brazil, the epidemic is spreading to rural counties. Until recently it has mainly affecting relatively more affluent areas, but there is now an evident spread of the epidemic to poorer areas.

Acquired Immunodeficiency Syndrome↗
PubMedDate not supplied

[Spatial analysis of tonal superthreshold signals in dolphins].

Hearing characteristics under the conditions of spacial indetermination of overthreshold tonic signal were studied on dolphins Tursiops truncatus by the method of motordigestive conditional reflexes. High efficiency of spacial analysis on the frequencies 5, 20, 80, 100 kHz was shown. The criterium of relative loss of information in the channel was used for evaluating integral index of efficiency of dolphin spacial hearing.

Animals↗
PubMed2005

Spatial analysis of the distribution of Ehrlichia chaffeensis, causative agent of human monocytotropic ehrlichiosis, across a multi-state region.

Ehrlichia chaffeensis, which causes human monocytotrophic ehrlichiosis (HME), is an important emerging tick-borne pathogen in the southeastern and southcentral United States. The endemnicity probability of E. chaffeensis and, by implication, locations with risk for HME, was predicted by using two modeling methods. This is first large-scale study to use geospatial analyses to estimate the distribution of E. chaffeensis, and it was conducted using data from a prototypic surveillance system that used white-tailed deer as natural sentinels. Analyses included the E. chaffeensis serostatus for 563 counties from 18 states. Both kriging and logistic regression models provided very reliable portrayals of E. chaffeensis occurrence and predicted that E. chaffeensis distribution had good concordance with human case data. The integration of a deer surveillance system with geospatial analyses was useful in developing HME risk maps that will be useful for identifying high-risk areas for public health interventions such as prevention and control efforts.

Ehrlichia chaffeensis↗
PubMed2005

Socio-demographic and geographic indicators and distribution of tuberculosis in Hong Kong: a spatial analysis.

OBJECTIVE: To determine the socio-demographic and geographic indicators responsible for the distribution and transmission of tuberculosis (TB) in Hong Kong using geographical information system (GIS) technology. MATERIALS AND METHODS: All patients with bacteriologically proven TB over a period of 3 years (May 1999-April 2002) residing within Hong Kong Island were studied. Molecular characterisation of their sputum isolates by IS6110-based restriction fragment length polymorphism (RFLP) technique was performed. Socio-demographic data were derived from the 2001 Hong Kong population census. Geographic coordinates of patients' addresses were linked to the GIS; large street block groups (LSBGs) were the units of analysis. RESULTS: Of 2387 patients with bacteriologically confirmed TB, 2332 had valid addresses distributed in 430 LSBGs in Hong Kong Island. Of the five socio-demographic indicators studied, significant correlations were found between the rate of TB in an LSBG and low educational attainment, elderly population and low-income household, but not population density or unemployment. The five socio-demographic indicators were not different between LSBG with clustered cases and those with unique cases. CONCLUSION: Low educational attainment, old age and poverty were significant determinants of the rate of TB in different parts of Hong Kong, while none of the socio-demographic indicators was related to disease transmission.

Aged↗