Serodiagnosis Of Ovine Hydatidosis
By: Javaid, M
| Dr. Asif Rabbani.
Contributor(s): Dr. Mubasher Saeed Mian | Dr. Muhammad | Faculty of Veterinary Sciences.
Material type: 
BookPublisher: 1993Subject(s): Department of ParasitologyDDC classification: 0359,T Dissertation note: A study was under taken to find out the incidence of hydatidosis and to evaluate the efficacy of indirect haemagglutination (IHA) test for the confirmation of natural hydatidosis in sheep slaughtered at Lahore municipal abattoir.
Blood samples from 200 sheep (50 each from hydatidosis affected and free sheep on the basis of postmortem findings and 100 blood samples Elected randomly without considering postmortem finding). The serum from each sample was separated, properly labelled and stored at -20°C.
For the preparation of antigen, crude cyst fluid was aspirated aseptically from hydatid cysts. Blood from healthy sheep was collected in 3.8% sodium citrate solution and red blood cells were separated by centrifugation. A 2.5% red cell suspension was prepared in Phosphate Buffered Saline (PBS). The sheep erythrocytes were sensitized by Hydatid fluid antigen. Optimal dilution of antigen 1:16 was used in Phosphate Buffered Saline (p11 6.4) for sensitizing the sheep erythrocytes. All the sera were inactivated at 56°C for half an hour and serial two f1d serum dilutions were prepared by micropipettes in microtitre U plates and sensitized erythrocytes were added to the plates and incubated at room temperature in a humid chamber for 3 hours. A titre of 1:32 and above was considered as positive. In positive reactions, the cells agglutinated like a carpet at the bottom of the wells where as in negative cases the cells settled as a compact mass in the centre of the wells. By the indirect haemagglutination test Ninety-two percent sheep were found positive for hydatidosis. (Table-4.2). Out of 50 serum samples (Group A2), 46 (92%) were confirmed positive on postmortem while 3 out of 50 (6%) hydatid free samples (Group A3), gave false positive results with IHA test.
It was concluded that indirect haemagglutination test is an accurate, reliable and sensitive test (92%) for the diagnosis of hydatidosis in sheep.
The blood cell counts (TLC, DLC) and blood chemistry (Total protein, A/G ratio) of the samples under investigation were also carried out. From the results it was evident that the hydatid cysts did not affect the blood values of the host significantly. However, only 28% of hydatid positive animals showed eosinophilia ranging from 7 to 23% which was non pathognomonic.
It was thus inferred that blood cell counts and blood c1vmistry of the hydatid cyst patients was of no diagnostic value.
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UVAS Library Thesis Section | Veterinary Science | 0359,T (Browse shelf) | Available | 0359,T |
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A study was under taken to find out the incidence of hydatidosis and to evaluate the efficacy of indirect haemagglutination (IHA) test for the confirmation of natural hydatidosis in sheep slaughtered at Lahore municipal abattoir.
Blood samples from 200 sheep (50 each from hydatidosis affected and free sheep on the basis of postmortem findings and 100 blood samples Elected randomly without considering postmortem finding). The serum from each sample was separated, properly labelled and stored at -20°C.
For the preparation of antigen, crude cyst fluid was aspirated aseptically from hydatid cysts. Blood from healthy sheep was collected in 3.8% sodium citrate solution and red blood cells were separated by centrifugation. A 2.5% red cell suspension was prepared in Phosphate Buffered Saline (PBS). The sheep erythrocytes were sensitized by Hydatid fluid antigen. Optimal dilution of antigen 1:16 was used in Phosphate Buffered Saline (p11 6.4) for sensitizing the sheep erythrocytes. All the sera were inactivated at 56°C for half an hour and serial two f1d serum dilutions were prepared by micropipettes in microtitre U plates and sensitized erythrocytes were added to the plates and incubated at room temperature in a humid chamber for 3 hours. A titre of 1:32 and above was considered as positive. In positive reactions, the cells agglutinated like a carpet at the bottom of the wells where as in negative cases the cells settled as a compact mass in the centre of the wells. By the indirect haemagglutination test Ninety-two percent sheep were found positive for hydatidosis. (Table-4.2). Out of 50 serum samples (Group A2), 46 (92%) were confirmed positive on postmortem while 3 out of 50 (6%) hydatid free samples (Group A3), gave false positive results with IHA test.
It was concluded that indirect haemagglutination test is an accurate, reliable and sensitive test (92%) for the diagnosis of hydatidosis in sheep.
The blood cell counts (TLC, DLC) and blood chemistry (Total protein, A/G ratio) of the samples under investigation were also carried out. From the results it was evident that the hydatid cysts did not affect the blood values of the host significantly. However, only 28% of hydatid positive animals showed eosinophilia ranging from 7 to 23% which was non pathognomonic.
It was thus inferred that blood cell counts and blood c1vmistry of the hydatid cyst patients was of no diagnostic value.
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