Facing the Human and Animal Brucellosis Conundrums: The Forgotten Lessons.

Brucellosis is a major zoonotic disease caused by Brucella species. Historically, the disease received over fifty names until it was recognized as a single entity, illustrating its protean manifestations and intricacies, traits that generated conundrums that have remained or re-emerged since they were first described. Here, we examine confusions concerning the clinical picture, serological diagnosis, and incidence of human brucellosis. We also discuss knowledge gaps and prevalent confusions about animal brucellosis, including brucellosis control strategies, the so-called confirmatory tests, and assumptions about the primary-binding assays and DNA detection methods. We describe how doubtfully characterized vaccines have failed to control brucellosis and emphasize how the requisites of controlled safety and protection experiments are generally overlooked. Finally, we briefly discuss the experience demonstrating that S19 remains the best cattle vaccine, while RB51 fails to validate its claimed properties (protection, differentiating infected and vaccinated animals (DIVA), and safety), offering a strong argument against its current widespread use. These conundrums show that knowledge dealing with brucellosis is lost, and previous experience is overlooked or misinterpreted, as illustrated in a significant number of misguided meta-analyses. In a global context of intensifying livestock breeding, such recurrent oversights threaten to increase the impact of brucellosis.

Fiebre de malta: Reporte de caso / Malta fever: Clinical case

Resumen Introducción: La fiebre de malta (brucelosis) es una infección zoonótica producida por cocobacilos gramnegativos, intracelulares facultativos, los cuales se transmiten por el consumo de productos animales no pasteurizados infectados, el contacto de la piel o las membranas mucosas con tejido animal infectado, fluidos animales infectados e inhalación de partículas aerosolizadas infectadas. Caso: Hombre de 34 años residente en zona rural, quien se dedicaba a la ganadería, ingreso a urgencias por presentar cuadro clínico de 15 días de evolución consistente en picos febriles no cuantificados asociados a escalofríos, astenia, adinamia y mialgias. Mediante la correlación clínico-patológica se llegó al diagnóstico de infección por Brucella Abortus. Conclusión : Esta patología es más frecuente en varones adultos. Dentro del cuadro clínico, Los estudios de serológicos (anticuerpos, aglutinación y ensayo inmunocromatográfico) tienen la mayor sensibilidad y especificidad diagnostica. El tratamiento se da con medicamentos que actúen en entornos intracelulares ácidos (tetraciclinas, aminoglucosidos, fluoroquinolonas), esto con el fin de controlar la enfermedad, prevenir las complicaciones y evitar las recaídas.

Abstract Introduction: Malta fever (brucellosis) is a zoonotic infection produced by intracellular gram-negative coccobacilli, which is transmitted by the consumption of infected unpasteurized animal products, skin contact or mucous membranes with infected animal tissues and fluids, and inhalation of infected aerosolized particles. Case: A 34-year-old man living in a rural area, who works in livestock, was admitted to the emergency department for presenting a clinical picture of 15 days of evolution of unquantified febrile peaks associated with symptoms such as chills, asthenia, adynamia and myalgia. The diagnosis of infection with Brucella Abortus was given through clinical-pathological correlation. Conclusion: This pathology is more frequent in adult males. Serological studies (antibodies, agglutination and immunochromatographic assay) prove to have the highest sensitivity and diagnostic specificity in the clinical picture. The treatment is given with medication that acts on intracellular acidic environment (tetracyclines, aminoglycosides, fluoroquinolones), this in order to control the disease, and prevent complications and relapses.

Accidental exposure to Brucella abortus vaccines and occupational brucellosis among veterinarians in Minas Gerais state, Brazil.

Brucellosis is an important occupational disease, mainly among veterinarians, because of their frequent contact with sick animals, contaminated secretions and live attenuated anti-Brucella vaccines. This study aimed to determine the prevalence of accidental exposure to S19 and RB51 vaccine strains and occupational brucellosis among veterinarians registered to administer vaccinations in Minas Gerais, Brazil, as well as to identify the risk factors associated with accidental exposure to anti-Brucella abortus vaccines. Data were collected through an online questionnaire. Three hundred and twenty-nine veterinarians were included in the analyses using stratified random sampling. A multivariate logistic regression analysis was used to evaluate the predictors of accidental exposure to S19 and RB51 strains. Nearly one third of the veterinarians registered to administer bovine brucellosis vaccination in Minas Gerais, 32.83% (108/329) (95% confidence interval [CI]: 27.78-38.19%), reported having been accidentally exposed to S19 or RB51 vaccine strains. The exposure factors associated with this outcome included a score of personnel protective equipment (PPE) use during work (odds ratio [OR], 0.94; 95% CI: 0.89-0.98) and a score of knowledge about brucellosis symptoms, classified as poor (base category), intermediate (OR, 0.26; 95% CI: 0.07-0.87) or good (OR, 0.22; 95% CI: 0.07-0.62). In addition, 4.56% (15/329) (95% CI: 2.57-7.41%) of veterinarians reported that they had brucellosis, of which 46.67% (7/15) considered that the disease was due to accidental exposure to anti-B. abortus live attenuated vaccine. The prevalence of accidental exposure to B. abortus vaccine strains among veterinarians from Minas Gerais enrolled in the control of bovine brucellosis was high. The reduced knowledge about human brucellosis symptoms and lack of appropriate PPE use were risk factors from unintentional contact with S19 and RB51 vaccine strains.

'La fiebre de Malta': An Interface of Farmers and Caprine Brucellosis Control Policies in the Bajío Region, Mexico.

This article shows that socio-economic factors, defined here as practices, knowledge, interests, beliefs and experiences have a role in the adoption of brucellosis control strategies in the Bajío region, Mexico. We combined qualitative and quantitative methods to show that socio-economic factors with regard to goat husbandry and brucellosis control are not taken into account in the current policy to combat the disease in Mexico. Farmers ranked constraints like the price of goat milk more important than the control of the disease. The impact of brucellosis in goats is hidden to farmers, and the term brucellosis is still a strange name to them; it is better known as 'la fiebre de Malta' (Malta fever), which farmers are aware of and which they avoid by not drinking goat milk. Brucellosis control measures cause losses such as abortion due to vaccination and ear infections due to ear tagging. In the villages of the state of Michoacán, the uptake of a vaccination and testing programme was almost complete because it was offered for free, whereas in villages of Jalisco, vaccination was not adopted thoroughly because the cost of vaccination was high for farmers and because of a lack of veterinarians offering the service. Neither compensation for culling suspected infected goats does exist nor the infrastructure, like slaughterhouses, to ensure that goats that are brucellosis seropositive are not resold to neighbouring farmers. This article disputes the idea that brucellosis is confined to the lack of awareness and participation of farmers in control measures, but rather that policies are promulgated without a good knowledge of goat husbandry and farmers' perceptions. We claim that governmental authorities should reformulate the policy to take into account socio-economic factors shaping farmers' behaviour so that effective control measures will be adopted by goat farmers.