Virulence patterns of Aeromonas eucrenophila isolated from water and infected fish.
Six isolates of Aeromonas eucrenophila--2 from water and 4 from superficial skin ulcer of cat fish--were examined for haemagglutination, serum sensitivity, chitinase production and enterotoxicity, and correlation, if any, between them; only one strain showed haemagglutination and was inhibited by both D-mannose and L-fucose. All the strains showed resistance to normal human serum, but produced chitinase; one of them elaborated inducible chitinase. All these strains caused fluid accumulation only after 1-4 serial passages through rabbit ileal loops, of which one strain that elaborated inducible chitinase caused significantly more (p < 0.005) fluid accumulation. These observations indicate that there is no correlation between enterotoxicity and haemagglutination and/or serum resistance, and these properties did not change after animal passage. However, a correlation could be observed between elaboration of inducible chitinase and enterotoxin production.
Singh
D V
DV
Department of Microbiology, Banaras Hindu University, Varanasi, India. rgcbt.@md2.vsnl.net.in
Sanyal
S C
SC
D000333:Aeromonas / Q000201:enzymology / Q000235:genetics / Q000472:pathogenicity*; D000818:Animals; D002397:Catfishes / Q000382:microbiology*; D002688:Chitinases / Q000032:analysis; D004768:Enterotoxins / Q000032:analysis; D005393:Fish Diseases / Q000382:microbiology*; D005643:Fucose; D006386:Hemagglutination Tests / Q000662:veterinary; D006801:Humans; D007194:India; D008358:Mannose; D012883:Skin Ulcer / Q000662:veterinary*; D014774:Virulence; D014871:Water Microbiology
D004768:Enterotoxins; D005643:Fucose; D002688:Chitinases; D008358:Mannose