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Monitoring Babesia bovis infections in cattle by using PCR-based tests
J A Calder1, G R Reddy, L Chieves
1Department of Pathobiology, College of Veterinary Medicine, University of Florida, Gainesville 32611, USA. Cald103w@wonder.em.cdc.gov
Journal of Clinical Microbiology
|November 1, 1996
Summary
Polymerase chain reaction (PCR) tests show higher sensitivity for detecting Babesia bovis infections in cattle compared to the complement fixation (CF) test. These PCR advancements offer improved detection of low-level parasitemia, crucial for managing bovine babesiosis.
Area of Science:
- Veterinary Parasitology
- Molecular Diagnostics
- Bovine Diseases
Background:
- Bovine babesiosis, caused by Babesia bovis, is a significant concern in cattle farming.
- The complement fixation (CF) test is the current standard for screening in the United States.
- Limitations exist in detecting low-level parasitemia and carrier states with existing methods.
Purpose of the Study:
- To compare the diagnostic sensitivity and specificity of PCR tests against the CF test for Babesia bovis detection.
- To evaluate PCR test performance over the course of experimental infection in cattle.
- To assess the impact of parasitemia levels on diagnostic test accuracy.
Main Methods:
- Experimental infection of cattle with a cloned strain of Babesia bovis.
- Serial blood sample collection from day of infection up to 10 months post-infection.
- Application of three different PCR-based tests targeting the small-subunit rRNA gene.
- Estimation of parasitemia levels (percent infected erythrocytes) and comparison with CF test results.
Main Results:
- PCR tests demonstrated significantly higher average sensitivities (58-70%) compared to the CF test (6%).
- Both PCR and CF tests exhibited high specificity (96-100%).
- Parasitemia levels and time post-infection influenced the sensitivity and negative predictive value of PCR tests.
Conclusions:
- PCR-based tests offer superior sensitivity for detecting Babesia bovis, including low-level parasitemia characteristic of carrier states.
- PCR tests provide a valuable advancement for diagnosing bovine babesiosis, surpassing the sensitivity of the traditional CF test.
- Further research can optimize PCR protocols for routine application in bovine babesiosis surveillance.
