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Trypanosomes in foregut (salivary exudate) versus salivary glands. Chi squared analysis of numbers of flies with salivary exudate containing red, green or both trypanosome strains or none (expected numbers in brackets). Data from Table 4
| Green strain | Red strain | ||
| Infected | Uninfected | Total | |
| Infected | 34 (10) | 13 (37) | 47 |
| Uninfected | 11 (35) | 144 (120) | 155 |
| Total | 45 | 157 | 202 |
× 2 = 88.7, df = 1, P ≤ 0.001
