BMC Veterinary Research

Table 2 Analysis between the numbers of examined pigs based on OD value

From: A persistent epidemic of porcine epidemic diarrhoea virus infection by serological survey of commercial pig farms in northern Vietnam

Location	OD values
Location	< 0.320	0.320–1.0	1.1–2.0	2.1–3.0	≥ 3.1
Hai Duong	28	19	24	64	65
Hung Yen	22	37	28	60	53
Thai Binh	17	18	21	29	115
Total	67^a	74^a	73^a	153^ab	233^b

^a,b, The data within the same row with the different superscripts are significantly different at P<0.05.

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ISSN: 1746-6148

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