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Volume 12, Number 5—May 2006

Historical Review

Spatial Analysis of Sleeping Sickness, Southeastern Uganda, 1970–2003

Lea Berrang-Ford*Comments to Author , Olaf Berke*†, Lubowa Abdelrahman‡, David Waltner-Toews*, and John McDermott*§
Author affiliations: *University of Guelph, Guelph, Ontario, Canada; †University of Veterinary Medicine, Hannover, Germany; ‡Makerere University, Kampala, Uganda; §International Livestock Research Institute, Nairobi, Kenya

Main Article

Table

Cluster detection of sleeping sickness, southeastern, Uganda, 1970–2003

Interval (cluster) Districts in most likely cluster Cluster date No. observed cases No. expected cases Relative risk* p value Cluster radius (km)
1970–1975 Mayuge, Bugiri, and southern Iganga 1973–1975 63 8 8.3 0.0001 41
1976–1979 Northwest shift to include northern Mayuge, Iganga, Jinja, and southeastern Kamuli 1978–1979 311 23 13.5 0.0001 29
1980–1988 Wider extent, including Mayuge, Bugiri, Iganga, Jinja, and southern Kamuli 1985–1988 13,943 1,865 7.5 0.0001 45
1989–1997 As above, plus Tororo, Busia, eastern Mukono, southern Kayunga, and southern Pallisa 1989–1992 3,176 869 3.7 0.0001 74
1998–2003 (A)† Northwestern Iganga (Luuka county) and southern Kamuli 1999–2001 331 26 12.6 0.0001 19
(B)† Soroti 2001–2003 263 21 12.5 0.0001 22
(C)† Tororo (Osukulu subcounty) 2001–2002 89 7 12.9 0.0001 6
(D)† Mukono (subcounties of Buikwe, Buyikwe, Najja, Ngogwe, and Ssi) 1998 50 4 12.5 0.0001 0‡­­

*Observed no. cases/expected no. cases.
†Multiple clusters were identified during 1998–2003. Letters correspond to cluster labels in Figure 8.
­­­‡Cluster included only 1 observation representing 5 merged subcounties.

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