Table 1.

Comparison of the ability of laboratory methods to detect positive Streptococcus equi samples by sample source; nasopharyngeal wash (NPW) and guttural pouch lavage (GPL);the odds of detecting a positive from a NPW compared to a GPL sample were quantified by means of logistic regression

Laboratory Method	No. NPW + of All +(%)	No. GPL + of All + (%)	No. of NPW + of All NPW (%)	No. of GPL + of All GPL (%)	OR	95% CI	P Value
Direct PCR	19/35 (54)	16/35 (46)	19/134 (14)	16/59 (27)	0.44	0.21–0.92	.030
Flocked swab PCR	13/24 (54)	11/24 (46)	13/134 (10)	11/59 (19)	0.47	0.22–1.02	.056
Flocked swab culture	7/16 (44)	9/16 (56)	7/134 (5)	9/59 (15)	0.31	0.11–0.84	.021
Traditional culture	8/16 (50)	8/16 (50)	8/134 (6)	8/59 (14)	0.40	0.16–1.04	.059

OR, odds ratio; CI, confidence interval.