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

TABLE 2.

Pathogenicities of avian E. coli strain E3 and its plasmid-cured derivatives following aerosol exposure

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	1	2/15^*	13/15^*	15/15^*	14/15^*	14/15^*^{,^†}
E3	2	2/14^*	9/14^*	12/14^*	12/14^*	14/14^*^{,^†}
E3/1.1	1	1/15^*	0/15^{^†}	15/15^*	4/15^{^†,^‡}	1/15^{^‡}
E3/2.4	1	0/13^*	1/13^{^†}	12/13^*	4/13^{^†}	0/13^{^‡}
E3/2.4	2	2/13^*	0/13^{^†}	3/13^{^†}	3/13^{^†,^‡}	1/13^{^‡}
E3/2	1	0/14^*	0/14^{^†}	14/14^*	0/14^{^‡}	0/14^{^‡}
E3/3.4	2	2/13^*	9/13^*	13/13^*	13/13^*	8/13^*

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.