TABLE 3.

Relationship between lethality for 1-day-old chicks and presence of tsh in APEC

Serogroups	% of 149 tsh-positivea isolates in:
	LC1b	LC2	LC3
All	90.6	6.0	3.4
O1, O2, O78	97.8	0	2.2
All except O1, O2, O78	79.3	5.5	5.2

^aPositive PCR amplification using the Tsh1 primer set (Fig. 1 and Table 2). 

^bLethality classes LC1, LC2, and LC3 are detailed in the text.