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Disseminated Mycobacterium avium infection in young cats: overrepresentation of Abyssinian cats.
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Disseminated Mycobacterium avium infection in young cats: overrepresentation of Abyssinian cats.

Author: RM Baral Affiliation: Paddington Cat Hospital, 183 Glenmore Road, Paddington, NSW 2021, Australia. rbaral@catvet.com.auSS MetcalfeMB KrockenbergerMJ CattVR BarrsAll authors
Edition/Format: Article Article : English
Publication:Journal of feline medicine and surgery, 2006 Feb; 8(1): 23-44
Database:From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
Other Databases: WorldCatBritish Library Serials
Summary:
Disseminated Mycobacterium avium-intracellulare complex (MAC) infection was diagnosed in 10 young cats (1-5 years of age) from Australia or North America between 1995 and 2004. A further two cats with disseminated mycobacteriosis (precise agent not identified) were recognised during this period. Of the 12, 10 were Abyssinian cats, one was a Somali cat and one was a domestic shorthair cat. None of the cats tested  Read more...
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Details

Document Type: Article
All Authors / Contributors: RM Baral Affiliation: Paddington Cat Hospital, 183 Glenmore Road, Paddington, NSW 2021, Australia. rbaral@catvet.com.au; SS Metcalfe; MB Krockenberger; MJ Catt; VR Barrs; C McWhirter; CA Hutson; DI Wigney; P Martin; SC Chen; DH Mitchell; R Malik
ISSN:1098-612X
Language Note: English
Unique Identifier: 107735477
Awards:

Abstract:

Disseminated Mycobacterium avium-intracellulare complex (MAC) infection was diagnosed in 10 young cats (1-5 years of age) from Australia or North America between 1995 and 2004. A further two cats with disseminated mycobacteriosis (precise agent not identified) were recognised during this period. Of the 12, 10 were Abyssinian cats, one was a Somali cat and one was a domestic shorthair cat. None of the cats tested positive for either FeLV antigen or FIV antibody. The clinical course of these infections was indolent, with cats typically presenting for weight loss, initially in the face of polyphagia, with a chronicity of up to several months. Additional clinical features included lower respiratory tract signs and peripheral lymphadenomegaly. A marked diffuse interstitial pattern was evident in thoracic radiographs, even in cats without overt respiratory involvement. Hair clipped to perform diagnostic procedures tended to regrow slowly, if at all. Diagnosis was generally made by obtaining representative tissue specimens from mesenteric lymph nodes, liver or kidney at laparotomy, or from a popliteal lymph node. The primary antecedent event was most likely colonisation of either the alimentary or respiratory tract, followed by local invasion and eventual lymphatic and haematogenous dissemination. Nine cases were treated using combination therapy with agents effective for MAC infection in human patients. Two cats are still undergoing initial therapy and have responded. Of the remaining seven, all responded during long courses (5-14 months) of clarithromycin combined with either clofazimine or rifampicin, and a fluoroquinolone or doxycycline. Of these, three cats remain well (with durations between 2 months and 2 years following therapy); two developed recurrent disease (at 3 months and 2 years, respectively, following therapy) and have restarted therapy. The remaining two cats improved 1 year and 5 months, respectively, after diagnosis but ultimately succumbed. The two cats in which therapy was restarted have improved dramatically. Certain lines of Abyssinian and Somali cats likely suffer from a familial immunodeficiency that predisposes them to infection with slow-growing mycobacteria such as MAC.

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