Spatial point analysis based on dengue surveys at household level in central Brazil

Siqueira-Junior, João B.; Maciel, Ivan J.; Barcellos, Christovam; Souza, Wayner V.; Carvalho, Marilia S.; Nascimento, Nazareth E.; Oliveira, Renato M.; Morais-Neto, Otaliba; Martelli, Celina M. T.
January 2008
BMC Public Health;2008, Vol. 8 Issue 1, p361
Academic Journal
Background: Dengue virus (DENV) affects nonimunne human populations in tropical and subtropical regions. In the Americas, dengue has drastically increased in the last two decades and Brazil is considered one of the most affected countries. The high frequency of asymptomatic infection makes difficult to estimate prevalence of infection using registered cases and to locate high risk intra-urban area at population level. The goal of this spatial point analysis was to identify potential high-risk intra-urban areas of dengue, using data collected at household level from surveys. Methods: Two household surveys took place in the city of Goiania (∼1.1 million population), Central Brazil in the year 2001 and 2002. First survey screened 1,586 asymptomatic individuals older than 5 years of age. Second survey 2,906 asymptomatic volunteers, same age-groups, were selected by multistage sampling (census tracts; blocks; households) using available digital maps. Sera from participants were tested by dengue virus-specific IgM/ IgG by EIA. A Generalized Additive Model (GAM) was used to detect the spatial varying risk over the region. Initially without any fixed covariates, to depict the overall risk map, followed by a model including the main covariates and the year, where the resulting maps show the risk associated with living place, controlled for the individual risk factors. This method has the advantage to generate smoothed risk factors maps, adjusted by sociodemographic covariates. Results: The prevalence of antibody against dengue infection was 37.3% (95%CI [35.5-39.1]) in the year 2002; 7.8% increase in one-year interval. The spatial variation in risk of dengue infection significantly changed when comparing 2001 with 2002, (ORadjusted = 1.35; p < 0.001), while controlling for potential confounders using GAM model. Also increasing age and low education levels were associated with dengue infection. Conclusion: This study showed spatial heterogeneity in the risk areas of dengue when using a spatial multivariate approach in a short time interval. Data from household surveys pointed out that low prevalence areas in 2001 surveys shifted to high-risk area in consecutive year. This mapping of dengue risks should give insights for control interventions in urban areas.


Related Articles

  • Modelling zero-inflated spatio-temporal processes. Fernandes, Marcus V. M.; Schmidt, Alexandra M.; Migon, Helio S. // Statistical Modelling: An International Journal;2009, Vol. 9 Issue 1, p3 

    We consider models for spatio-temporal processes which assume either non-negative values, and often are observed as zero, or discrete values and are also inflated by zeros. Typically, in the first case, the spatial observations are obtained at fixed locations (point-referenced data) over a...

  • Mapping your move. Urbanska, Wanda; Levering, Frank // Country Journal;Jul/Aug98, Vol. 25 Issue 4, p16 

    Presents steps in choosing a small town for a family. Assessment of needs; Geographic considerations; Research by phone; Reminders when visiting the town. INSET: Quality-of-life checklist.

  • Workless households across the United Kingdom.  // Economic & Labour Market Review;Nov2010, Vol. 4 Issue 11, p8 

    The article looks at the number of workless households in Great Britain for the period of January to December 2009. Areas where more than three out of every ten households had no one in work are Liverpool, Nottingham and Glasgow City. Areas with the lowest percentages of workless households...

  • Go West, Young Man (and Woman). Johnson, Kirk; McKinley, Jesse; Kahn, Jeremy; Tavernise, Sabrina; Overbye, Dennis; Majerol, Veronica // New York Times Upfront;3/14/2011, Vol. 143 Issue 11, p5 

    The article reports that Austin and Dallas, Texas were the cities of choice among people ages 25 to 34, according to Brookings Institution.

  • Settlement Intention and Split Households: Findings from a Survey of Migrants in Beijing's Urban Villages. Fan, C. Cindy // China Review: An Interdisciplinary Journal on Greater China;Fall2011, Vol. 11 Issue 2, p11 

    For almost three decades, millions of rural--urban migrants in China have continued to circulate between their urban migrant work and their rural home, maintaining a split-household arrangement where some family members are left behind. Based on a survey of migrants in Beijing's urban villages...

  • How to check out your dream city.  // Glamour;Aug96, Vol. 94 Issue 8, p114 

    Offers advice when researching about a city for before relocation. Chamber of commerce; Library resources; Real estate agent; Computer resources.

  • The Fittest and Fattest Cities in America. Hübler, Eric // Men's Fitness;Mar2008, Vol. 24 Issue 2, p85 

    The article presents the results of the "Men's Fitness" 10th annual survey of the fittest & fattest cities in the U.S. Colorado Springs, Colorado won the fittest city designation. Ranking third in 2007, it has overtaken Albuquerque, New Mexico and held off Minneapolis, Minnesota to claim the...

  • THE RISE OF WIFE SECLUSION IN RURAL SOUTH-CENTRAL NIGER. Henquinet, Kari Bergstrom // Ethnology;Winter2007, Vol. 46 Issue 1, p57 

    This article examines the relationship of ideological and material factors in the rise of wife seclusion in two rural towns south of Maradi, Niger. Much of the literature on wife seclusion in Hausaland associates wife seclusion with urban or wealthier households, but it is also practiced in...

  • Community Profile: Northampton.  // BusinessWest;7/10/2006, Vol. 23 Issue 6, p24 

    The article presents demographic information on the city of Northampton in Massachusetts. These includes: type of government, population, households, number of owner-occupied housing units, registered voters, commercial and residential tax rates, average single family tax bill, assessed value of...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics