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Volume 24, Number 2—February 2018

Role of Environmental Factors in Shaping Spatial Distribution of Salmonella enterica Serovar Typhi, Fiji

Ruklanthi de AlwisComments to Author , Conall Watson, Birgit Nikolay, John H. Lowry, Nga Tran Vu Thieu, Tan Trinh Van, Dung Tran Thi Ngoc, Kitione Rawalai, Mere Taufa, Jerimaia Coriakula, Colleen L. Lau, Eric J. Nilles, W. John Edmunds, Mike Kama, Stephen Baker, and Jorge Cano
Author affiliations: London School of Hygiene and Tropical Medicine, London, UK (R. de Alwis, C. Watson, B. Nikolay, W.J. Edmunds, J. Cano); Oxford University Clinical Research Unit, Ho Chi Minh City, Vietnam (R. de Alwis, N.T.V. Thieu, T.T. Van, D.T.T. Ngoc, S. Baker); Oxford University, Oxford, UK (R. de Alwis, S. Baker); University of the South Pacific, Suva, Fiji (J.H. Lowry); Project Heaven, Suva (K. Rawalai); Ministry of Health and Medical Services, Suva (M. Taufa, M. Kama); Fiji National University, Suva (J. Coriakula); Australian National University, Canberra, Australian Capital Territory, Australia (C.L. Lau); World Health Organization Western Pacific Region, Suva (E.J. Nilles); Brigham and Women’s Hospital, Boston, Massachusetts, USA (E.J. Nilles); Harvard Medical School, Boston (E.J. Nilles)

Main Article

Table 3

Relative contributions of predictor variables from an ensemble of 50 boosted regression tree models for typhoid fever seropositivity developed with cross-validation on data from 1,305 samples and 11 variables, Fiji

Variable Data type Relative contribution, % (95% CI)
Age, y Continuous 33.0 (31.1–34.8)
Longitude, °E Continuous 15.5 (14.7–16.0)
Distance from major rivers and creeks, m Continuous 14.5 (13.6–15.3)
Annual rainfall, mm Continuous 9.3 (8.5–10.0)
Distance from flood-risk areas, m Continuous 7.7 (6.8–8.4)
Latitude, °S Continuous 6.9 (5.6–7.9)
Education Categorical 4.2 (3.8–4.6)
Urbanization Categorical 3.3 (2.9–3.8)
Typhoid fever vaccination Binary 2.3 (2.1–2.5)
Sewage disposal Categorical 1.8 (1.5–2.2)
Toilet type at home Categorical 0.8 (0.6–1.2)

Main Article

Page created: January 17, 2018
Page updated: January 17, 2018
Page reviewed: January 17, 2018
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