Document Detail

Ichthyophthiriasis in carp Cyprinus carpio: infectivity of trophonts prematurely exiting both the immune and non-immune host.
MedLine Citation:
PMID:  10401585     Owner:  NLM     Status:  MEDLINE    
Ichthyophthirius multifiliis exposed to naturally immunised carp established short-term infections, the majority of parasites actively emerging within 2 h of entering the epidermis. A small, but significant, number of these expelled parasites were shown to retain theront-like properties with the capacity to directly re-invade a further fish host. Infectivity fell rapidly with time in the host and was comparable to that of trophonts of a similar age artificially induced to emerge from non-immune hosts with the aid of MEM (minimal essential medium). Trophonts recovered with MEM from immune carp 2 to 8 h post infection rarely established infections upon exposure to susceptible new hosts and no infections resulted from older trophonts recovered after 8 to 24 h exposure; older trophonts, however, represented only a small percentage of the original parasite population. A low level of infectivity was recorded in trophonts collected with the aid of MEM from non-immune carp after up to 24 h of infection. The results are discussed in relation to theront transformation and evasion of the host immune response.
T Wahli; R A Matthews
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Diseases of aquatic organisms     Volume:  36     ISSN:  0177-5103     ISO Abbreviation:  Dis. Aquat. Org.     Publication Date:  1999 May 
Date Detail:
Created Date:  1999-08-31     Completed Date:  1999-08-31     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8807037     Medline TA:  Dis Aquat Organ     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  201-7     Citation Subset:  IM    
Centre for Fish and Wildlife Health, University of Berne, Switzerland.
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MeSH Terms
Carps / immunology*,  parasitology
Ciliophora Infections / immunology,  veterinary*
Disease Susceptibility / immunology
Fish Diseases / immunology*,  parasitology
Hymenostomatida / immunology,  pathogenicity*
Protozoan Infections, Animal / immunology*

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