Table 2.

Pathological signs in Atlantic salmon challenged with the LF-89 genogroup of P. salmonis at day 21 post-infection in cohabitant and control groups. Differences between vaccinated and unvaccinated fish were evaluated with a Chi-squared statistical test (* = p < 0.05). Abbreviations: UV: unvaccinated fish and V: vaccinated fish.

Group	Pathological Signs	Presence of Pathological Signs	Treatment		Proportion		Chi-Square Test
			UV	V	UV	V	X 2	p-Value
Cohabitant	Vacuolar	No	2	4	0.2	0.4	0.24	0.63
	degeneration	Yes	8	6	0.8	0.6
		Total	10	10
	Hepatitis	No	9	9	0.9	0.9	0	1
		Yes	1	1	0.1	0.1
		Total	10	10
	Hepatocyte	No	8	4	0.8	0.4	1.88	0.17
	atrophy	Yes	2	6	0.2	0.6
		Total	10	10
Control	Vacuolar	No	1	3	0.1	0.3	0.31	0.58
	degeneration	Yes	9	7	0.9	0.7
		Total	10	10
	Hepatitis	No	8	7	0.8	0.7	0	1
		Yes	2	3	0.2	0.3
		Total	10	10
	Hepatocyte	No	10	5	1	0.5	4.27	<0.05 *
	atrophy	Yes	0	5	0	0.5
		Total	10	10