Figure 1

Dying stumpy forms? In bloodstream form populations taken from Balb/c mice at 120 h post-infection, approximately 1.2% (122 of 1000 trypanosomes counted) were stumpy by morphology and positive by diaphorase (a cytochemical marker of stumpy forms), but had a nuclear structure suggestive of a nuclear degradation. Such forms were not observed at earlier time-points during the parasitaemia.