| Background: Brucellosis is known as a zoonotic disease with high morbidity in the absence of
treatment. The primary diagnosis of brucellosis can be effective to achieve satisfying treatment
results and prevent chronic infections. This study was aimed to compare the efficiency of
conventional microbiological and serological approaches with nested PCR for the rapid
diagnosis of human brucellosis.
Methods: A total of 120 subjects with symptoms of brucellosis were included in the study. The
sensitivity and specificity of nested PCR for detection of Brucella bacteria was compared with
serological and blood culture methods.
Results: Out of 120 patients enrolled, brucellosis was detected in 60.83% (73/120) of cases
based on serological tests with a blood culture confirmation in 8.33% of participants. Based on
results, 55% of cases were positive in serum agglutination test (SAT≥1:160), and Coombs (CSAT≥1:160) tests. Furthermore, 7 negative SAT cases were positive in C-SAT as evidence for
chronic brucellosis. Results of 2-mercaptoethanol (2-ME) ≥ 1:80 test were negative in 6 SAT-
positive cases. Based on nested PCR results, 68.18% SAT positive samples were also detected
by blood nested PCR and 56.06% through serum nested PCR method. The sensitivity of blood
nested PCR was significantly more than serum nested PCR, SAT≥1:160 and blood culture
(P<0.001). The specificity of the blood and serum nested PCR was also 100% compared with
blood culture and SAT≥ 1:160. In this study, nested PCR was able to identify chronic brucellosis
in SAT negative patients.
Conclusion: According to the findings of this study, nested PCR showed higher efficiency than
blood culture method for the rapid diagnosis of human brucellosis. Also, results are indicating
the high performance of nested PCR for the rapid diagnosis of both chronic and acute
brucellosis. |