Table 1. Comparison of IMS-PCR and Direct PCR results for 280 lymph node samples –74 non-visibly lesioned (NVL) and 206 visibly lesioned (VL).
| Type of sample (No.) | IMS-PCR+, Direct PCR + | IMS-PCR +, Direct PCR − | IMS-PCR −, Direct PCR + | IMS-PCR −, Direct PCR − | χ2 (P value.a) |
| VL (206) | 71 | 59 | 36 | 40 | 4.594 (0.032) |
| NVL (74) | 18 | 14 | 17 | 25 | 0.000 (0.000) |
| All (280)b | 89 | 73 | 53 | 65 | 3.150 (0.076) |
a
Determined by McNemar's Chi-Square test using Genstat version 14.2.
b
Includes 166 VL and 74 NVL samples from TB skin test reactor animals plus 40 VL samples from non-reactor animals detected at routine slaughter.
Data represent number of samples with each combination of test results.