Epidemiological studies on tuberculosis in cattle and human contacts
Mohamed Waheed El-Din Abd El-Ghany;
Abstract
Two field trials were made to compare the diagnostic value of human and bovine PPDs. Moreover, it was intended to isolate mycobacteria from cattle reacting to PPD and from human contacts.
1) In the first trial, 124 cross-bred dairy cattle in Sharkia Governorate were subjected to the single intradermal cervical tuberculin test using human PPD where 36 (29%) proved positive. These reactors were retested using bovine PPD after 8 weeks from the time of the first test, where 33 (91.7%) cases reacted positively.
2) In the second trial, 60 cross-bred dairy cattle in Sharkia Governorate were simultaneously tested with human and bovine PPDs where 22 (36.7%) reacted positively to both PPDs, 3 (5%) reacted to human PPD only and 18 (30%) reacted to bovine PPD only. On the other hand 17 (28.3%) were negative.
3) Out of the eighteen cases positive to bovine PPD and negative to human PPD (Second trial), 8 cases were subjected to ELISA testing where 5 cases proved positive.
4) The prevalence rate of bovine tuberculosis in this study amounted to
33.2%.
5) Some of the human PPD reactors (55 animals) were submitted for slaughtering. TB lesions were found in 39 (71%) while 16 (29%) were NVL reactors. Mixed pulmonary and extrapulmonary tuberculosis was dominated with a rate of 41%, pulmonary tuberculosis was found in 11 cases (28.2%). Each of extrapulmonary and generalized TB gave a rate of
15.4%.
6) Mycobacteriological examination was carried out on both tuberculous and NVL reactors. Mycobacteria were recovered from 33 cases (out of 55
. subjected to bacteriological examination) with a recovery rate of (60%).
7) Typing ofmycobactrial isolates revealed: 26 strains ofM.bovis (47.3%)
and 7 MOTT (12.7%), including 3 M.kansasii, 2 M.gordonae, 1
M.flavesens and 1 M.fortuitum.
1) In the first trial, 124 cross-bred dairy cattle in Sharkia Governorate were subjected to the single intradermal cervical tuberculin test using human PPD where 36 (29%) proved positive. These reactors were retested using bovine PPD after 8 weeks from the time of the first test, where 33 (91.7%) cases reacted positively.
2) In the second trial, 60 cross-bred dairy cattle in Sharkia Governorate were simultaneously tested with human and bovine PPDs where 22 (36.7%) reacted positively to both PPDs, 3 (5%) reacted to human PPD only and 18 (30%) reacted to bovine PPD only. On the other hand 17 (28.3%) were negative.
3) Out of the eighteen cases positive to bovine PPD and negative to human PPD (Second trial), 8 cases were subjected to ELISA testing where 5 cases proved positive.
4) The prevalence rate of bovine tuberculosis in this study amounted to
33.2%.
5) Some of the human PPD reactors (55 animals) were submitted for slaughtering. TB lesions were found in 39 (71%) while 16 (29%) were NVL reactors. Mixed pulmonary and extrapulmonary tuberculosis was dominated with a rate of 41%, pulmonary tuberculosis was found in 11 cases (28.2%). Each of extrapulmonary and generalized TB gave a rate of
15.4%.
6) Mycobacteriological examination was carried out on both tuberculous and NVL reactors. Mycobacteria were recovered from 33 cases (out of 55
. subjected to bacteriological examination) with a recovery rate of (60%).
7) Typing ofmycobactrial isolates revealed: 26 strains ofM.bovis (47.3%)
and 7 MOTT (12.7%), including 3 M.kansasii, 2 M.gordonae, 1
M.flavesens and 1 M.fortuitum.
Other data
| Title | Epidemiological studies on tuberculosis in cattle and human contacts | Other Titles | دراسات وبائية عن السل فى الماشية والمخالطين الأدمين | Authors | Mohamed Waheed El-Din Abd El-Ghany | Issue Date | 1996 |
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