Failure to identify non-bovine reservoirs of Mycobacterium bovis in a region with a history of infected dairy-cattle herds

Citation
Sd. Pillai et al., Failure to identify non-bovine reservoirs of Mycobacterium bovis in a region with a history of infected dairy-cattle herds, PREV VET M, 43(1), 2000, pp. 53-62
Citations number
11
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Veterinary Medicine/Animal Health
Journal title
PREVENTIVE VETERINARY MEDICINE
ISSN journal
0167-5877 → ACNP
Volume
43
Issue
1
Year of publication
2000
Pages
53 - 62
Database
ISI
SICI code
0167-5877(20000105)43:1<53:FTINRO>2.0.ZU;2-G
Abstract
The State of Texas had the most (cumulative) tuberculous cattle herds of an y state in the United States during the decade ending in 1997. Of the cumul ative 18 infected herds in Texas, 12 herds were concentrated in El Paso Cou nty (designated the 'El Paso milkshed'). To identify whether non-bovine res ervoirs were a source of Mycobacterium bovis infection of cattle in this re gion, an investigation was conducted on the premises of 14 dairy herds (12 tuberculous and 2 non-affected herds) between May 1995 and June 1997. None of the 670 mammalian, avian and environmental (soil,:water and air) samples collected and cultured from the premises of these herds was positive for t he presence of M. bovis. None of the 119 human urine samples obtained from employees of these dairies was culture positive for M, bovis. Of 124 dairy- farm workers with tuberculin skin-test results, 48 showed positive test res ults, There was, however, no difference in percentages of positive skin-tes t results between farms without, and farms having, bovine tuberculosis with in the last two years or longer. The percentage of positive reactions did n ot increase with length of time employed at a dairy with a history of confi rmed tuberculosis. These findings suggest that non-bovine reservoirs appear not to be a factor responsible for tuberculosis of cattle in the Fl Paso m ilkshed. (C) 2000 Elsevier Science B.V. All rights reserved.