Figure 4From: Transmission of infectious laryngotracheitis virus vaccine and field strains: the role of degree of contact and transmission by whole blood, plasma and poultry dustExperiment 1 CONTACT. Proportion of chickens becoming infected with ILTV strains, A20, Serva and Class 9 over time following different modes of exposure. P values are based on Kaplan–Meier survival analysis.Back to article page