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 4 Experiment 1 CONTACT

ILTV strains	Clinical sign	Proportion of chickens (%) showing ILT clinical signs by mode of exposure
ILTV strains	Clinical sign	Eye drop (%)	In- contact (%)	Shared airspace (%)	All modes of exposure
A20	Conjunctivitis	0/7 (0.00)	2/7 (28.6)	0/15 (0.00)	2/29 (7)
	Respiratory signs	0/7 (0.00)	0/7 (0.00)	0/15 (0.00)	0/29 (0.00)
	Demeanour	0/7 (0.00)	0/7 (0.00)	0/15 (0.00)	0/29 (0.00)
	Any clinical signs	0/7 (0.00)	2/7 (29)	0/15 (0.00)	2/29 (7)
Serva	Conjunctivitis	6/8 (75)^abA	7/8 (87.5)^a	5/16 (31.3)^b	18/32 (56)^A
	Respiratory signs	0/8 (0.00)^B	0/8 (0.00)	0/16 (0.00)	0/32 (0.00)^B
	Demeanour	0/8 (0.00)^aB	1/8 (12.5)	0/16 (0.00)	1/32 (3)^B
	Any clinical signs	6/8 (75)^ab	7/8 (88)^a	5/16 (31)^b	18/32 (56)
Class 9	Conjunctivitis	8/8 (100)^aA	8/8 (100)^aA	7/15 (46.7)^bA	23/31 (74)^A
	Respiratory signs	0/8 (0.00)^B	2/8 (25)^B	2/15 (13.3)^B	4/31 (13)^B
	Demeanour	0/8 (0.00)^B	1/8 (12.5)^B	0/15 (0.00)^B	1/31 (3)^B
	Any clinical signs	8/8 (100)	8/8 (100)	9/15 (60)	25/31 (81)

Type and frequency of clinical signs observed over the full period of 21 dpe showing interaction between the effects of ILTV strain and mode of exposure.
^abDifferent lowercase superscripts indicate significant differences within rows.
^ABUppercase superscripts indicate a significant differences within columns for each ILTV strain.

ISSN: 1297-9716