Table 4. Prevalence of T. b. rhodesiense in tsetse through incorporation of dissection/microscopy and PCR data.

Tsetse species	Number of tsetse examined	Number positive dissection/microscopy	Number positive by PCR for T. brucei s.l.
G. swynnertoni	3737	104	31	0.83%	0.083%	0.010%CI 0–0.054
G. pallidipes	1691	29	12	0.71%	0.071%	0.0085%CI 0–0.059

All fly midguts where trypanosomes were observed by microscopy were analysed by PCR., Dis_pos is the proportion of flies examined that were positive by dissection/microscopy, PCR_pos is the proportion of dissection/microscopy positive flies that were also positive by PCR for T. brucei s.l., P_Tbr/Tbb is the ratio of T. b. rhodesiense to T. b. brucei and P_mat is the proportion assumed to mature to the salivary glands. CI are 95% confidence intervals.