Transmission of infectious laryngotracheitis virus vaccine and field strains: the role of degree of contact and transmission by whole blood, plasma and poultry dust

Table 3 Experiment 1 CONTACT. Summary of analyses of clinical scores and ILTV GC in choanal cleft swabs (LSM ±S.E) showing treatment effects and their significance

Factors and levels	Clinical signs		qPCR result of choanal cleft swabs
Factors and levels	N.positive/total (%)	Clinical score	N.positive/total (%)	Log₁₀ GC/reaction
Overall	45/92 (49)	0.23 ± 0.04	81/92 (88)	4.23 ± 0.09
Factor and level
Mode of exposure	P = 0.0013	P < 0.0001	P < 0.0019	P < 0.0001
Eye drop	14/23 (61)^a	0.35 ± 0.05^a	23/23 (100)^a	5.02 ± 0.16^a
In-contact	17/23 (74)^a	0.39 ± 0.05^a	23/23 (100)^a	4.78 ± 0.16^a
Shared airspace	14/46 (30)^b	0.09 ± 0.04^b	35/46 (76)^b	2.89 ± 0.12^b
ILTV Strains	P < 0.0001	P < 0.0001	P < 0.0001	P = 0.09
A20	2/29 (7)^c	0.02 ± 0.05^c	18/29 (62)^b	3.95 ± 0.16^a
Serva	18/32 (56)^b	0.27 ± 0.05^b	32/32 (100)^a	4.39 ± 0.15^a
Class 9	25/31 (81)^a	0.55 ± 0.05^a	31/31 (100)^a	4.35 ± 0.15^a
dpe	P = 0.12	P < 0.0001		P < 0.0001
3	–	–		2.86 ± 0.16^b
5	6/95 (6)	0.1 ± 0.05^c		–
6	13/95 (14)	0.21 ± 0.05^bc		4.65 ± 0.16^a
7	13/95 (14)	0.21 ± 0.05^bc		–
8	20/95 (21)	0.33 ± 0.05^ab		–
9	21/95 (22)	0.44 ± 0.05^a		–
10	16/95 (17)	0.28 ± 0.05^abc		4.69 ± 0.16^a
11	21/95 (22)	0.39 ± 0.05^ab		–
13	15/95 (16)	0.29 ± 0.05^ab		–
14	17/95 (18)	0.26 ± 0.05^abc		4.35 ± 0.16^a
15	21/95 (22)	0.32 ± 0.05^ab		–
16	18/95 (19)	0.28 ± 0.05^abc		–
17	16/95 (17)	0.26 ± 0.05^abc		4.31 ± 0.16^a
18	21/95 (22)	0.26 ± 0.05^abc		–
21	23/95 (24)	0.29 ± 0.05^ab		4.51 ± 0.16^a
Interaction (P-value)
ILTV strain*Dpe		P < 0.0001		P < 0.0001
ILTV strains*ME		P < 0.0155		P < 0.0001
Mode of exposure*Dpe		P < 0.0001		P < 0.0001
ILTV strainsMEDpe		P < 0.0001		P < 0.0001

Summary of analyses of clinical scores and ILTV GC in choanal cleft swabs (LSM ± S.E) showing treatment effects and their significance.
^*dpe: days post-exposure, GC: genome copy, ME: mode of exposure.
^abcDifferent letters within columns for each factor indicate significant differences between levels (P < 0.05). Bold text indicates statistically significant values (P < 0.05).

ISSN: 1297-9716