Table 3. Presence of viral antigen in ducks infected with HP VN/1203/K and HP VN/1203/E virus.

Virus	Route of	No of	Days	No. Antigen Positive (Ave Score of Positive Tissues)C
	Infection	DucksA	piB	Spleen	Lung	Brain	Heart	Pancreas
VN/1203/K	Inoculated	3*	7	0	0	1 (2)	1 (2)	0
	Contact	3*	6.3	3 (1.7)	1 (1)	3 (2.7)	3 (2)	2 (2)
VN/1203/E	Inoculated	3*	6.8	0	0	3 (2)	3 (1.7)	2 (1.3)
	Contact	5*	6.3	0	1 (1)	3 (1.7)	3 (2)	1 (2)
VN/1203/K	Inoculated	6	3	0	2 (1)	3 (1.3)	4 (1.3)	0
		6	4	0	2 (1.5)	1 (2)	4 (1.3)	1 (1)
		6	6	0	0	1 (1)	2 (1.5)	0
VN/1203/E	Inoculated	6	3	0	1 (1)	3 (1.7)	6 (1.7)	1
		6	4	0	0	5 (1.4)	6 (1.8)	2D(1)
		6	6	0	0	1 (1)	4 (1.7)	0

^AThe ducks with an asterix are obtained from the experiment described in Table 2. The ducks without an asterix are from the pathogenesis experiment.

^BThe days pi reflect the mean time to death for the ducks with asterix or the time of euthanasia.

^CNumber of samples positive for virus antigen as measured by immunohistochemistry. Scoring system: 1 = Antigen sparse, 2 = Antigen common, 3 = Antigen abundant.

^DOnly 5 samples available.