Tsetse fly biology: where it all starts.- Trypanolytic activity of NHS: a first defense.- Antigenic variation: the answer to host immunity.- Early onset of host immunity: the big unknown.- Myeloid cells: parasite control versus pathology.- Adaptive immunity - T cells: old and new views on defense part I.- Adaptive immunity - B cells: old and new views on defense part II.- Proteomics of trypanosomes: what's in there.- Diagnosis: when to treat and when...