. 2000 Mar;68(3):1535–1541. doi: 10.1128/iai.68.3.1535-1541.2000

TABLE 3.

Pathogenicities of E. coli strain DH5α carrying pVM01 and strain E3/2.4 after reintroduction of pVM01 compared to that of the virulent parent strain E3

Strain	Expt no.	Mortality rate^a	Lesion rate^b	Rate of reisolation^c from:
Strain	Expt no.	Mortality rate^a	Lesion rate^b	Cloaca	Trachea	Air sac
E3	3	0/16^*^{,^†}	11/16^*	4/16^*^{,^†,^∥}	13/16^*^{,^†,^§}	9/10^*
E3	4	4/16^*	16/16^{^†}	8/16^*^{,^†,^‡}	15/16^*^{,^†}	14/16^*
E3	5	0/16^*^{,^†}	12/16^*^{,^†}	10/16^{^†,^‡}	15/16^*^{,^†}	11/16^*^{,^†}
E3	6	1/15^*^{,^†}	12/15^*^{,^†}	15/15^{^§}	15/15^{^†}	13/15^*
DH5α/4	6	0/17^{^†}	3/17^{^‡,^§}	1/17^{^∥,^#}	0/15^{^‡}	0/17^{^‡}
DH5α/5	6	0/17^{^†}	4/17^{^‡,^§}	0/17^{^#}	0/15^{^‡}	0/17^{^‡}
E3/2.4	5	0/17^{^†}	2/17^{^‡}	3/17^*^{,^∥,^#}	8/17^{^§}	1/17^{^‡}
E3/2.4/1	3	0/14^*^{,^†}	7/14^*^{,^§}	10/14^{^‡,}^**	10/14^*^{,^§}	3/14^{^‡,^§}
E3/2.4/6	4	0/16^*^{,^†}	13/16^*^{,^†}	10/16^{^†,^‡}	14/16^*^{,^†}	9/16^*^{,^†,^§}
E3/2.4/9	4	1/17^*^{,^†}	13/17^*^{,^†}	16/17^{^§,}^**	15/17^*^{,^†}	10/17^*^{,^†,^§}
E3/2.4/9	5	1/17^*^{,^†}	12/17^*	17/17^{^§}	16/17^*^{,^†}	11/17^*^{,^†}
E3/2.4/10	3	1/16^*^{,^†}	7/16^*^{,^‡,^§}	14/16^{^‡,^§,}^**	13/16^*^{,^†,^§}	7/16^{^†}

No. of birds which died or were euthanized/total no. of birds. In each column, proportions with the same superscript symbols are not significantly different (P > 0.05 by Fisher's exact test).

No. of birds with lesions/total no. of birds.

No. of birds from which the inoculated strain of E. coli was isolated from each of the three sites swabbed/total no. of birds.