Brucellosis: a retrospective evaluation of 164 cases

<p><b>INTRODUCTION</b>Brucellosis is a public health problem that is prevalent in several developing countries.</p><p><b>METHODS</b>The clinical and laboratory characteristics of 164 cases of brucellosis in Bursa, Turkey, were retrospectively evaluated.</p><p><b>RESULTS</b>The ages of the 164 patients ranged from 15-85 years. All of the patients underwent the Rose Bengal test and 163 (99.4%) patients tested positive. 122 (74.4%) patients were diagnosed with acute brucellosis, 31 (18.9%) with subacute brucellosis and 11 (6.7%) with chronic brucellosis. Focal involvement was found in 101 (61.6%) patients. Although patients with focal involvement had a higher white blood cell count (p = 0.002), those without focal involvement had higher aspartate transaminase and alanine transaminase values, and lower platelet values (p = 0.005, 0.007 and 0.039, respectively). Spondylodiscitis was observed on imaging in 58 (66.7%) of the 87 patients who presented with back pain. Among the 118 patients who were examined within the first month of treatment, 79 (66.9%) responded to treatment. The relapse rate was 11.6% among all 164 patients.</p><p><b>CONCLUSION</b>Brucellosis should be considered as a differential diagnosis among patients who present with fever, and joint or back pain. Focal involvement should be investigated in the presence of leucocytosis, and subacute or chronic forms of brucellosis. To identify cases of spondylodiscitis, radiography should be performed in patients who present with back pain.</p>

Brucella abortus L7/L12 recombinant protein induces strong Th1 response in acute brucellosis patients

Because of high morbidity of the brucellosis in humans and the potential use of the microorganism as an agent of biologic warfare, protection of effective vaccines and specific diagnostic reagents become necessary to eradicate brucellosis. In this study we aimed to investigate the cytokine responses and changes in peripheral blood lymphocyte subgroups of acute brucellosis patients in response to L7/L12 and glyceraldehyde 3-phosphate dehydrogenase [GAPDH] recombinant proteins derived from Brucella abortus. levels of IFN- gamma, IL-4 and IL-10 secreted from PBMCs of 25 acute brucellosis patients and 15 healthy controls, stimulated with Phytohemagglutinin [PHA], L7/L12 or GAPDH were measured by ELISA. Furthermore alterations in lymphocyte subgroups in response to these Brucella antigens were determined by flow cytometry. Extracellular IFN- gamma levels were found to be elevated after stimulation with L7/L12 in patients with acute brucellosis, whereas no significant changes were found in IL-4 and IL-10 levels. Similar data was also obtained with GAPDH, but the stimulation of IFN- gamma production was not observed in all patients and was not as strong as that observed for L7/L12. Moreover, when the distribution of lymphocytes subgroups [CD3+, CD3+CD4+, CD3+ CD8+, CD4+ CD25+, CD3+ CD69+ and CD3+ CD152+] was evaluated, it was found that the stimulation with L7/L12 and GAPDH only led to an increase in the percentage of CD3+ CD69+ lymphocytes. These data indicate that Brucella abortus L7/L12 or GAPDH induce a Th1 type immune response in acute brucellosis patients. Additionally, these recombinant proteins, especially L7/L12, may be used in new vaccine preparations and diagnostic tests