Transactions of the Royal Society of Tropical Medicine and Hygiene Volume 99, Issue 4, Pages 243-319 (April 2005) 1. Clinical pattern of severe Plasmodium falciparum malaria in Sudan in an area characterized by seasonal and unstable malaria transmission • ARTICLE Pages 243-251 H.A. Giha, G. ElGhazali, T.M.E. A-Elgadir, I.E. A-Elbasit, E.M. Eltahir, O.Z. Baraka, M.M. Khier, I. Adam, M. Troye-Blomberg, T.G. Theander and M.I. Elbashir 2. Ecological mechanisms that promote arbovirus survival: a mathematical model of Ross River virus transmission • ARTICLE Pages 252-260 K. Glass 3. Periodic deworming with albendazole and its impact on growth status and diarrhoeal incidence among children in an urban slum of India • ARTICLE Pages 261-267 D. Sur, D.R. Saha, B. Manna, K. Rajendran and S.K. Bhattacharya 4. Echinococcosis in Tunisia: a cost analysis • ARTICLE Pages 268-278 Meghan M. Majorowski, Hélène Carabin, Mohamed Kilani and Afif Bensalah 5. A randomized, double-blind, controlled trial of the effects of ivermectin at normal and high doses, given annually or three-monthly, against Onchocerca volvulus: ophthalmological results • ARTICLE Pages 279-289 Grace Fobi, Jacques Gardon, Joseph Kamgno, Laurence Aimard-Favennec, Christian Lafleur, Nathalie Gardon-Wendel, Brian O.L. Duke and Michel Boussinesq 6. Laboratory-based influenza surveillance in New Caledonia, 1999–2003 • ARTICLE Pages 290-300 Alain Berlioz-Arthaud and Ian G. Barr 7. Associations between filarial and gastrointestinal nematodes • ARTICLE Pages 301-312 Helen Faulkner, Joseph Turner, Jerzy Behnke, Joseph Kamgno, Marie-Claire Rowlinson, Janette E. Bradley and Michel Boussinesq