FACTORS INFLUENCING THE TRANSMISSION OF SCHISTOSOMA JAPONICUM IN THE MOUNTAINS OF SICHUAN PROVINCE OF CHINA

ROBERT C. SPEAR Center for Occupational and Environmental Health, School of Public Health, University of California, Berkeley, California: Sichuan Institute of Parasitic Diseases, Chengdu, People’s Republic of China; Department of Microbiology and Tropical Medicine, The George Washington Medical Center, Washington, District of Columbia

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EDMUND SETO Center for Occupational and Environmental Health, School of Public Health, University of California, Berkeley, California: Sichuan Institute of Parasitic Diseases, Chengdu, People’s Republic of China; Department of Microbiology and Tropical Medicine, The George Washington Medical Center, Washington, District of Columbia

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SONG LIANG Center for Occupational and Environmental Health, School of Public Health, University of California, Berkeley, California: Sichuan Institute of Parasitic Diseases, Chengdu, People’s Republic of China; Department of Microbiology and Tropical Medicine, The George Washington Medical Center, Washington, District of Columbia

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MERRILL BIRKNER Center for Occupational and Environmental Health, School of Public Health, University of California, Berkeley, California: Sichuan Institute of Parasitic Diseases, Chengdu, People’s Republic of China; Department of Microbiology and Tropical Medicine, The George Washington Medical Center, Washington, District of Columbia

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ALAN HUBBARD Center for Occupational and Environmental Health, School of Public Health, University of California, Berkeley, California: Sichuan Institute of Parasitic Diseases, Chengdu, People’s Republic of China; Department of Microbiology and Tropical Medicine, The George Washington Medical Center, Washington, District of Columbia

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DONGCHUAN QIU Center for Occupational and Environmental Health, School of Public Health, University of California, Berkeley, California: Sichuan Institute of Parasitic Diseases, Chengdu, People’s Republic of China; Department of Microbiology and Tropical Medicine, The George Washington Medical Center, Washington, District of Columbia

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CHANGHONG YANG Center for Occupational and Environmental Health, School of Public Health, University of California, Berkeley, California: Sichuan Institute of Parasitic Diseases, Chengdu, People’s Republic of China; Department of Microbiology and Tropical Medicine, The George Washington Medical Center, Washington, District of Columbia

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BO ZHONG Center for Occupational and Environmental Health, School of Public Health, University of California, Berkeley, California: Sichuan Institute of Parasitic Diseases, Chengdu, People’s Republic of China; Department of Microbiology and Tropical Medicine, The George Washington Medical Center, Washington, District of Columbia

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FASHEN XU Center for Occupational and Environmental Health, School of Public Health, University of California, Berkeley, California: Sichuan Institute of Parasitic Diseases, Chengdu, People’s Republic of China; Department of Microbiology and Tropical Medicine, The George Washington Medical Center, Washington, District of Columbia

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XUEGUANG GU Center for Occupational and Environmental Health, School of Public Health, University of California, Berkeley, California: Sichuan Institute of Parasitic Diseases, Chengdu, People’s Republic of China; Department of Microbiology and Tropical Medicine, The George Washington Medical Center, Washington, District of Columbia

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GEORGE M. DAVIS Center for Occupational and Environmental Health, School of Public Health, University of California, Berkeley, California: Sichuan Institute of Parasitic Diseases, Chengdu, People’s Republic of China; Department of Microbiology and Tropical Medicine, The George Washington Medical Center, Washington, District of Columbia

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Twenty villages in the Anning River Valley of southwestern Sichuan China were surveyed for Schistosoma japonicum infections in humans and domestic animals. Also surveyed were human water contact patterns, snail populations, cercarial risk in irrigation systems, and agricultural land use. Few animals were infected, while village prevalence of infection in humans ranged from 3% to 68% and average village eggs per gram of stool ranged from 0 to 110. Except for occupation and education, individual characteristics were not strong determinants of infection intensity within a village. Differences in human infection intensity between these villages are strongly associated with crop type, with low-intensity villages principally growing rice, in contrast to villages devoting more land to vegetables and tobacco. Cercarial risk in village irrigation systems is associated with snail density and human infection intensity through the use of manure-based fertilizer. Some of the agricultural and environmental factors associated with infection risk can be quantified using remote sensing technology.

Author Notes

Reprint requests: Robert C. Spear, Center for Occupational and Environmental Health, School of Public Health, University of California, 140 Earl Warren Hall, #7360, Berkeley, CA 94720-7360.
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