. 2012 Mar;80(3):1025–1036. doi: 10.1128/IAI.06016-11

Table 4.

Direct transmission to naïve pigs^a

No. of days^b	No. of contact pigs positive/total no. of pigs^c
No. of days^b	KM22 (Bvg^WT)	TN23 (Bvg⁺)
2	0/2	1/2
8	2/2	2/2
84	2/2	2/2

Three days after 16 primary pigs were challenged by the intranasal route with 10⁶ CFU of the contact strain, two naïve pigs were added to each room. Four primary-challenged pigs were removed on days 7, 14, 31, and 57 for necropsy, leaving only transmission pigs in the room beyond day 57.

Days after initial contact with primary-challenged pigs.

Data are reported as the number of contact pigs positive out of a possible of two pigs for respective strain of B. bronchiseptica.