TABLE 4.

Summary of results obtained in cross‐validation tests

Serological positive evidence
	N. pos iELISA/N. tested	N. pos cELISA/N. iELISA‐pos	N. pos IFT/N. iELISA‐pos	N. pos (cELISA, IFT and iELISA)/N. sera tested by the 3 methods
Old sera	12/26 (46.2%)	2/8 (25%)	8/8 (100%)	2/8 (25.0%)
Recent sera	23/62 (37.1%)	13/13 (100%)	10/10 (100%)	10/28 (35.7%)
Total	35/88 (39.8%)	15/21 (71.4%)	18/18 (100%)	12/36 (33.3%)

Serological negative evidence
	N. neg iELISA/N. tested	N. neg cELISA/N. iELISA‐neg	N. neg IFT/N. iELISA‐neg	N. neg (cELISA & IFT& iELISA)/N. sera tested by the 3 methods
Old sera	14/26 (53.8%)	14/14 (100.0%)	3/4 (75%)	3/8 (37.5%)
Recent sera	39/62 (62.9%)	20/28 (71.4%)	17/26 (65.4%)	9/28 (32.1%)
Total	53/88 (60.2%)	34/40 (85%)	20/30 (66.7%)	12/36 (33.3%)

Doubtful results were excluded from the analysis.