FIG. 2.

Accumulation of H₂O₂ in xanthine-supplemented sera from uninfected and trypanosome-infected Cape buffaloes and cattle. Xanthine was dissolved in Cape buffalo (●) or bovine (■) serum (1 ml) to give a final concentration of 400 μM xanthine. The preparations were incubated at 37°C for 30 min, and H₂O₂ in the <3-kDa fraction was assayed. Results are means and SD of sera from three Cape buffaloes and mean values only of sera from two calves before and at various days after infection with T. brucei and T. congolense 1180.