Secondary infection with Streptococcus suis serotype 7 increases the virulence of highly pathogenic porcine reproductive and respiratory syndrome virus in pigs

Table 2 Respiratory disease scores and clinical signs

Group no.(n)	Designation	Respiratory disease scores	CNS disease	Diarrhea	Athrepsy	Bacteremia	Viremia
1(8)	Control	0.0 ± 0.0^a	0/8^a	0/8^a	0/8^a	0/8^a	0/8^a
2(12)	PRRSV	1.8 ± 0.3^b	4/12^b	5/12^b	11/12^b		12/12^b
3(10)	SS7	1.0 ± 0.2^c	0/10^a	7/10^b	0/10^a	0/10^a
4(12)	PRRSV+SS7	2.1 ± 0.4^b	0/2,8/10^c	0/2,7/10^b	0/2,10/10^b	10/10^b	12/12^b

a, b, c, Values with different superscripts are significantly different (P < 0.05) as determined by Fisher's exact test.

ISSN: 1743-422X