Overview
Brucella suis spondylitis, while less commonly reported compared to other forms of Brucella infections, represents a significant diagnostic and therapeutic challenge, particularly in regions where the organism is endemic. This condition primarily affects individuals with occupational or recreational exposure to infected animals, such as pigs, or those who have traveled to endemic areas. The insidious nature of the infection often leads to delayed diagnosis and can result in chronic spinal involvement, complicating both clinical presentation and management. Understanding the epidemiology, clinical presentation, diagnostic approach, and management strategies is crucial for effective patient care. Given the limited but growing body of evidence, this guideline aims to provide clinicians with a comprehensive framework for addressing Brucella suis spondylitis. [PMID:40680150]
Epidemiology
Brucella suis infections, including spondylitis, predominantly affect individuals with specific risk factors such as occupational exposure to pigs or other infected animals, travel to endemic regions, and consumption of unpasteurized dairy products. Epidemiological studies highlight that these risk factors are pivotal in the transmission and subsequent development of chronic infections like spondylitis. For instance, a systematic review encompassing fifteen studies identified cases of Brucella-related periprosthetic joint infections (PJIs) in total knee arthroplasty (TKA) patients, underscoring the broader spectrum of musculoskeletal involvement beyond joints. While these studies primarily focused on PJIs, the underlying principles regarding risk factors are applicable to spondylitis as well. Occupational exposure, particularly in farming and abattoir settings, significantly elevates the risk due to frequent contact with infected animals. Travel history to regions where Brucella suis is endemic, such as parts of Europe, Asia, and South America, further increases susceptibility. These findings emphasize the importance of thorough patient history taking, especially regarding travel and occupational exposures, in clinical settings where Brucella infections are suspected. [PMID:40680150]
Clinical Presentation
The clinical presentation of Brucella suis spondylitis is often characterized by its insidious onset and nonspecific symptoms, which can mimic other chronic spinal conditions such as degenerative disc disease or inflammatory arthritis. Patients typically report chronic low back pain, which may progressively worsen over time. Additional symptoms can include stiffness, particularly in the morning, and limited spinal mobility. Neurological deficits, such as radiculopathy or even cauda equina syndrome in severe cases, may occur due to spinal cord or nerve root compression. The nonspecific nature of these symptoms often leads to delayed diagnosis, as initial presentations frequently overlap with more common spinal pathologies like aseptic loosening in prosthetic joint infections. This diagnostic challenge necessitates a high index of suspicion, especially in patients with relevant exposure histories. Early recognition is crucial to prevent irreversible spinal damage and associated complications. [PMID:40680150]
Diagnosis
Diagnosing Brucella suis spondylitis requires a multifaceted approach given the nonspecific clinical presentation and the need to rule out other potential causes of spinal pathology. The cornerstone of diagnosis involves a combination of clinical suspicion based on patient history, particularly travel and occupational exposures, and confirmatory laboratory testing. Serological tests, including agglutination tests (e.g., Wright, 2ME), ELISA, and Western blot, are commonly employed to detect antibodies against Brucella antigens. However, these tests can sometimes yield false negatives, especially in the early stages of infection or in immunocompromised patients. Polymerase Chain Reaction (PCR) assays targeting Brucella DNA in blood, cerebrospinal fluid (CSF), or tissue samples offer a more sensitive and specific diagnostic tool but may not always be readily available. Imaging studies, such as MRI, are invaluable for visualizing spinal involvement, showing characteristic features like bone marrow edema, discitis, and vertebral body abnormalities. In clinical practice, a combination of serological evidence, imaging findings suggestive of chronic spondylitis, and a strong epidemiological link is typically required for definitive diagnosis. [PMID:40680150]
Management
The management of Brucella suis spondylitis is multifaceted, combining prolonged antibiotic therapy with surgical intervention when necessary. Antibiotic treatment typically involves a combination regimen aimed at achieving high efficacy and minimizing resistance. Commonly used antibiotics include doxycycline and rifampicin, often administered for an extended period of at least six months, as evidenced by studies on related Brucella infections such as PJIs. These antibiotics target the intracellular survival mechanisms of Brucella, making combination therapy essential. In cases where there is significant spinal instability, neurological compromise, or persistent infection despite medical management, surgical intervention may be warranted. Two-stage revision surgery, as seen in the management of Brucella PJIs, can be considered for severe spondylitis cases, particularly when there is evidence of structural damage necessitating stabilization and debridement. Post-surgical care includes continued antibiotic therapy to ensure eradication of the infection and prevent recurrence. Close monitoring for potential complications, such as implant failure or persistent inflammation, is crucial throughout the treatment course. [PMID:40680150]
Complications
Despite advances in diagnostic techniques and treatment protocols, Brucella suis spondylitis carries significant risks of complications that can impact long-term outcomes. Prolonged antibiotic therapy, while essential for eradicating the infection, can lead to side effects such as hepatotoxicity, nephrotoxicity, and gastrointestinal disturbances. Additionally, the chronic nature of the infection and the necessity for surgical interventions increase the risk of implant-related complications, including infection persistence, hardware failure, and further spinal instability. Variability in diagnostic approaches and treatment strategies across different clinical settings can contribute to inconsistent outcomes, highlighting the need for standardized protocols. Neurological complications, arising from spinal cord compression or nerve root involvement, can result in permanent deficits if not promptly addressed. Regular follow-up evaluations, including imaging studies and clinical assessments, are critical to monitor for these complications and adjust management strategies accordingly. [PMID:40680150]
Key Recommendations
These recommendations aim to streamline the diagnostic and therapeutic approach to Brucella suis spondylitis, ensuring optimal patient outcomes through a structured and evidence-based strategy. [PMID:40680150]
References
1 Greer K, Brutti J, Grand Z, Rasmussen J, Rockwell M, Davis T et al.. A 10-Year Systematic Review of Brucella Periprosthetic Joint Infections Following Total Knee Arthroplasty. JBJS reviews 2025. link
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