Table 2.

Disease symptoms in challenged carp in relation to Aeromonas species and serogroups.

Lesions after challenge	Species	Serogroups
Only external (ulcers or dermatitis)	A. bestiarum	O16, O18, O33, PGO1, PGO2, PGO4
	A. salmonicida	O11, O16, O33, O18, PGO1, PGO2, PGO6
	A. sobria	O3, O16, PGO1
Only internal	A. veronii bt. sobria**	O41 (strain W62)
Both external and internal	A. hydrophila**	O11, O16, PGO10, PGO11
	A. bestiarum*	O3, O11, PGO6
	A. salmonicida**	O3
	A. veronii bt. sobria**	O6, O11, O33, O41 (strains K166, K170), PGO2, PGO4

* Increased moistness of internal organs, enlarged spleen, anaemia and/or haemorrhages in liver-pancreas; **systemic infection.