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Summary of salivary gland infections. Chi squared analysis of numbers of salivary glands containing red, green or both trypanosome strains or none (expected numbers in brackets). Data from Table 6
| Green strain | Red strain | ||
| Infected | Uninfected | Total | |
| Infected | 35 (2) | 42 (75) | 77 |
| Uninfected | 21 (54) | 1714 (1681) | 1735 |
| Total | 56 | 1756 | 1812 |
× 2 = 481.9, df = 1, P ≤ 0.001
