The effect of treatment with papaya latex on faecal egg counts in mice infected with 200 L3 of H. bakeri (A) or 100 eggs of T. muris (B). In some cases, the error bars do not show because they are very tight and obscured by the mean data point. In (A) treatment with papaya latex (133 nmol active cysteine proteinase/mouse/day) or water was initiated on day 18 and continued daily until day 24 . In (B) the first dose of papaya latex (337 nmol active cysteine proteinase/mouse/day) or water was given on day 48 and continued daily until day 54 . In both figures, the days of treatment are shown by vertical arrows on the abscissa. Reprinted with permission.