The early ultrastructural stages of Loma salmonae were studied in the gills of experimentally infected rainbow trout. No parasitic stages were identified during the first 2 wk of the infection. By week 3 postexposure (PE), uninucleate and binucleate meronts were recognized within host cells (no xenomas) associated with the capillary channels of secondary lamellae and lamellar arteries. An inflammatory reaction was absent. In secondary lamellae, infected cells were isolated from the capillary lumen, and some were recognized as pillar cells. In lamellar arteries, infected cells were localized beneath the endothelium and not in the lumen. Inflammatory reaction and destruction of parasites inside blood cells in the lumen of secondary lamellae were observed by week 4 PE. Three hypotheses, i.e., isolation, internalization, and evasion, are proposed to explain the localization of the infected cells in the gills. It is concluded that meronts are the earliest parasitic stage observed by week 3 PE, pillar cells are secondarily infected by phagocytosis of infected cells in the blood, endothelial cells of gills are not infected, and inflammatory response to the parasite starts by week 4 PE.
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April 2002
FUNCTIONAL MORPHOLOGY|
April 01 2002
ULTRASTRUCTURAL STUDY OF THE EARLY DEVELOPMENT AND LOCALIZATION OF LOMA SALMONAE IN THE GILLS OF EXPERIMENTALLY INFECTED RAINBOW TROUT
L. E. Rodríguez-Tovar;
L. E. Rodríguez-Tovar
Department of Pathology and Microbiology, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada C1A 4P3. [email protected]
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G. M. Wright;
G. M. Wright
Department of Pathology and Microbiology, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada C1A 4P3. [email protected]
* Department of Anatomy and Physiology, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, Prince Edward Island, Canada C1A 4P3
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D. W. Wadowska;
D. W. Wadowska
Department of Pathology and Microbiology, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada C1A 4P3. [email protected]
† Graduate Studies & Research, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, Prince Edward Island, Canada C1A 4P3
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D. J. Speare;
D. J. Speare
Department of Pathology and Microbiology, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada C1A 4P3. [email protected]
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R. J F. Markham
R. J F. Markham
Department of Pathology and Microbiology, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada C1A 4P3. [email protected]
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J Parasitol (2002) 88 (2): 244–253.
Citation
L. E. Rodríguez-Tovar, G. M. Wright, D. W. Wadowska, D. J. Speare, R. J F. Markham; ULTRASTRUCTURAL STUDY OF THE EARLY DEVELOPMENT AND LOCALIZATION OF LOMA SALMONAE IN THE GILLS OF EXPERIMENTALLY INFECTED RAINBOW TROUT. J Parasitol 1 April 2002; 88 (2): 244–253. doi: https://doi.org/10.1645/0022-3395(2002)088[0244:USOTED]2.0.CO;2
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