Table 3.

Distribution by age of BVDV and BHV-1 seropositive individuals among animals older than 6 months, in 11 dairy herds in the Khon Kaen province, Thailand, 2001.

Age (years)	No. of animals	BVDV*		BHV-1*
		No. of positive	Prevalence (%)	No. of positive	Prevalence (%)
> 6	70	35	50	15	21
4–6	57	11	19	3	5
2–4	110	22	20	0	0
0.5–2	114	15	13	0	0
Total	351	83	24	18	5

* Sera with CODs ≥ 0.20 were interpreted as seropositive.