Table 1.

Sample Characterization

					Test methods
	Year/group		No. of animals	Avg age (mo)	Microbiology	Necropsy	Histology
Main room	Year	2012	97	12.2 ± 6.8	20	33	68
		2013	106	10.1 ± 6.8	21	34	71
		2014	184	13.3 ± 8.1	21	24	157
		2015	120	14.2 ± 7.8	15	15	112
		Total	507	12.7 ± 7.7	77	106	408
	Group	Routine	189	10.6 ± 5.2	65	80	112
		NR-healthy	114	16.2 ± 9.7	4	7	113
		NR-sick	204	12.8 ± 7.7	8	19	183
		Total	507	12.7 ± 7.7	77	106	408
Quarantine room	Year	2012	29	7.0 ± 3.0	11	12	16
		2013	55	7.2 ± 4.5	15	19	36
		2014	51	10.4 ± 5.0	11	11	38
		2015	51	9.7 ± 8.4	9	8	41
		Total	186	9.3 ± 6.3	46	50	131
	Group	Routine	137	9.2 ± 5.9	43	46	88
		NR-Healthy	23	11.7 ± 6.1	3	3	20
		NR-Sick	26	7.9 ± 7.8	0	1	23
		Total	186	9.3 ± 6.3	46	50	131
TOTAL Main room + Quarantine			693	11.8 ± 7.5	123	156	539

Numbers of animals do not always match numbers of tests because the same specimen may be used for necropsy and microbiology.

NR, nonroutine; No, number; Avg, average; mo, months.