Table 2. Percentages of individuals trapped in Tompkins County that tested positive for M. gallisepticum.
| Family or group | n | % PCR+ | %RPA+ | χ2(1df) | P |
| Picidae | 41 | 2.4 | 2.4 | 0.00 | 1.0 |
| Paridae | 196 | 0.0 | 8.2 | 15.40 | 0.0001 |
| Mimidae | 46 | 0.0 | 6.5 | 3.10 | 0.08 |
| Cardinalidae | 42 | 2.4 | 9.5 | 1.91 | 0.17 |
| Emberizidae | 243 | 2.1 | 4.5 | 2.33 | 0.13 |
| Icteridae | 100 | 3.0 | 2.0 | 0.21 | 0.65 |
| Fringillidae | 1056 | 5.5 | 2.1 | 16.84 | <0.0001 |
| without house finches | 725 | 2.5 | 1.5 | 1.72 | 0.19 |
| house finch only | 331 | 12.1 | 3.3 | 17.87 | <0.0001 |
| Passeridae | 111 | 1.0 | 5.4 | 3.69 | 0.055 |
% PCR+: % of birds whose eye swab contained M. gallisepticum DNA; % RPA+: % of birds in which we detected M. gallisepticum-specific antibodies in a blood sample. The χ2 values and associated P-values stem from the comparisons of the number of individuals that were PCR or RPA positive.