Goussia carpelli (Protozoa : Coccidia) infection in stressed and immunosuppressed common carp Cyprinus carpio

Citation
D. Steinhagen et al., Goussia carpelli (Protozoa : Coccidia) infection in stressed and immunosuppressed common carp Cyprinus carpio, DIS AQU ORG, 34(3), 1998, pp. 199-204
Citations number
29
Categorie Soggetti
Aquatic Sciences
Journal title
DISEASES OF AQUATIC ORGANISMS
ISSN journal
01775103 → ACNP
Volume
34
Issue
3
Year of publication
1998
Pages
199 - 204
Database
ISI
SICI code
0177-5103(19981130)34:3<199:GC(:CI>2.0.ZU;2-2
Abstract
Goussia carpelli causes enteritic coccidiosis in juvenile carp. In nature i t affects carp fry (1 to 2 mo old) and fish (3 to 4 mo old) which are subje cted to environmental stress. Carp treated with corticosteroids or subjecte d to temperature stress in the laboratory produced higher numbers of oocyst s during the primary infection. Resistance to reinfection via the fecal con tamination route, however, was not reduced by the application of hydrocorti sone, dexamethasone, or X-ray irradiation given both prior to and concurren tly with reinfection. The administration of hydrocortisole or irradiation d id not induce a relapse of a previous infection. Carp which had been immuno suppressed by hydrocortisole injection during a primary infection were also refractory to a secondary infection via fecal contamination. The results o f these experiments suggest that the mechanisms which are responsible for t he resistance of carp to secondary infections with Goussia carpelli were no t affected by hydrocortisole, dexamethasone or X-ray treatment.