RESEARCH 12. Deichmann U. A medium resolution population database for Africa. Database documentation and digital database. Santa Barbara (CA): National Center for Geographic Information and Analysis, University of California; 1994. 13. Herman JR, Bhartia PK, Torres O, Hsu C, Seftor C, Celarier E. Global distribution of UV-absorbing aerosols from Nimbus 7/TOMS data. J Geophys Res 1997;102:16911–22. 14. New M, Hulme M, Jones P. Representing twentieth-century space- time climate variability. Part 1: development of a 1961–90 mean monthly terrestrial climatology. J Clim 1999;12:829–56. 15. Thomson MC, Connor SJ. Environmental information systems for the control of arthropod vectors of disease. Med Vet Entomol 2000;14:227–44. 16. Mpairwe Y, Matovu HL. Cerebrospinal meningitis in east Africa 1911–1965. Trans R Soc Trop Med Hyg 1971;65:70–7. 17. Diggle P, Moyeed R, Rawlingson B, Thomson M. Childhood malar- ia in the Gambia: a case study in model-based geostatistics. Appl Stat 2002;51:493–506. 18. Molineaux L. Climate and meningococcal disease. [PhD Thesis]. Berkeley (CA): University of Berkeley; 1969. 19. Waddy BB. Climate and respiratory infections. Lancet 1952;263:674–7. 20. Greenwood BM, Blakebrough IS, Bradley AK, Wali S, Whittle HC. Meningococcal disease and season in sub-Saharan Africa. Lancet 1984;326:1339–42. 21. Besancenot JP, Boko M, Oke PC. Weather conditions and cere- brospinal meningitis in Benin (Gulf of Guinea, West Africa). Eur J Epidemiol 1997;13:807–15. 22. Molesworth AM, Cuevas LE, Morse AP, Herman JR, Thomson MC. Dust clouds and spread of infection. Lancet 2002;359:81–2. Address for correspondence: Madeleine C. Thomson, International Research Institute for Climate Prediction (IRI), The Earth Institute of Columbia University, Lamont Campus, POB 1000, Palisades, New York, 10964, USA; fax: 1-845-680-4864; email: mthomson@iri.columbia.edu Search past issues of EID at www.cdc.gov/eid Emerging Infectious Diseases • Vol. 9, No. 10, October 2003 1293