-
Biomedicine & Pharmacotherapy =... Dec 2023Nano-based drug delivery systems are increasingly used for diagnosis, prevention and treatment of several diseases, thanks to several beneficial properties, including... (Review)
Review
Nano-based drug delivery systems are increasingly used for diagnosis, prevention and treatment of several diseases, thanks to several beneficial properties, including the ability to target specific cells or organs, allowing to reduce treatment costs and side effects frequently associated with chemotherapeutic medications, thereby improving treatment compliance of patients. In the field of communicable diseases, especially those caused by intracellular bacteria, the delivery of antibiotics targeting specific cells is of critical importance to maximize their treatment efficacy. Brucella melitensis, an intracellular obligate bacterium surviving and replicating inside macrophages is hard to be eradicated, mainly because of the low ability of antibiotics to enter these phagocityc cells . Although different antibiotics regimens including gentamicin, doxycycline and rifampicin are in fact used against the Brucellosis, no efficient treatment has been attained yet, due to the intracellular life of the respective pathogen. Nano-medicines responding to environmental stimuli allow to maximize drug delivery targeting macropages, thereby boosting treatment efficacy. Several drug delivery nano-technologies, including solid lipid nanoparticles, liposomes, chitosan, niosomes, and their combinations with chitosan sodium alginate can be employed in combination of antibiotics to successfully eradicate Brucellosis infection from patients.
Topics: Humans; Chitosan; Brucellosis; Anti-Bacterial Agents; Brucella melitensis; Drug Delivery Systems
PubMed: 37979375
DOI: 10.1016/j.biopha.2023.115875 -
Zoonoses and Public Health Aug 2019Brucellosis is a widespread zoonotic disease considered as an emerging and re-emerging disease with a resulting threat of public health and animal health. Official...
Brucellosis is a widespread zoonotic disease considered as an emerging and re-emerging disease with a resulting threat of public health and animal health. Official reports document an animal incidence in Kazakhstan of about 0.6% per year, and the country still registers high number of human cases annually . The main objective of this paper was to evaluate the distribution and economic impact of brucellosis in Kazakhstan. We analysed human disease incidence data obtained from the Government Sanitary & Epidemiological Service with the aim to estimate the burden of disease in terms of disability-adjusted life years (DALYs). We also estimated the economic impact in terms of monetary losses. Additionally, we mapped the geographical distribution of the disease throughout Kazakhstan. In total, 1,334 human cases of brucellosis were registered in 2015 in Kazakhstan that resulted in 713 DALYs. Around $21 million was spent on compensation for animals that had to be slaughtered due to brucellosis, and an additional $24 million was spent on testing animals. Animal brucellosis and human brucellosis occur throughout the whole country, some trends of which are reviewed in this paper. We estimated the burden of the disease and explored possible explanation for high human incidence rates. This paper is the first to estimate the human burden of disease and the economic costs in Kazakhstan. Both of these are substantial.
Topics: Animals; Brucella; Brucellosis; Cattle; Cattle Diseases; Humans; Incidence; Kazakhstan; Time Factors; Zoonoses
PubMed: 31090193
DOI: 10.1111/zph.12582 -
PloS One 2022Bovine brucellosis is endemic in Rwanda, although, there is a paucity of documented evidence about the disease in slaughtered cattle. A cross-sectional study was...
Bovine brucellosis is endemic in Rwanda, although, there is a paucity of documented evidence about the disease in slaughtered cattle. A cross-sectional study was conducted in slaughtered cattle (n = 300) to determine the seroprevalence of anti-Brucella antibodies using the Rose Bengal Test (RBT), and indirect enzyme-linked immunosorbent assay (i-ELISA). Corresponding tissues were cultured onto a modified Centro de Investigación y Tecnología Agroalimentaria (CITA) selective medium and analysed for Brucella spp. using the 16S-23S ribosomal interspacer region (ITS), AMOS, and Bruce-ladder PCR assays. The seroprevalence was 20.7% (62/300) with RBT, 2.9% (8/300) with i-ELISA, and 2.9% (8/300) using both tests in series. Brucella-specific 16S-23S ribosomal DNA interspace region (ITS) PCR detected Brucella DNA in 5.6% (17/300; Brucella culture prevalence). AMOS-PCR assay identified mixed B. abortus and B. melitensis (n = 3), B. abortus (n = 3) and B. melitensis (n = 5) while Bruce-ladder PCR also identified B. abortus (n = 5) and B. melitensis (n = 6). The gold standard culture method combined with PCR confirmation identified 5.6% Brucella cultures and this culture prevalence is higher than the more sensitive seroprevalence of 2.9%. This emphasizes the need to validate the serological tests in Rwanda. The mixed infection caused by B. abortus and B. melitensis in slaughtered cattle indicates cross-infection and poses a risk of exposure potential to abattoir workers. It is essential to urgently strengthen a coordinated national bovine brucellosis vaccination and initiate a test-and-slaughter program that is not presently applicable in Rwanda.
Topics: Cattle; Animals; Brucella; Seroepidemiologic Studies; Rwanda; Brucellosis, Bovine; Cross-Sectional Studies; Brucellosis; Rose Bengal
PubMed: 36413520
DOI: 10.1371/journal.pone.0261595 -
Veterinary Research Apr 2012Brucellosis is a zoonosis caused by Brucella species. Brucellosis research in natural hosts is often precluded by practical, economical and ethical reasons and mice are... (Review)
Review
Brucellosis is a zoonosis caused by Brucella species. Brucellosis research in natural hosts is often precluded by practical, economical and ethical reasons and mice are widely used. However, mice are not natural Brucella hosts and the course of murine brucellosis depends on bacterial strain virulence, dose and inoculation route as well as breed, genetic background, age, sex and physiological statu of mice. Therefore, meaningful experiments require a definition of these variables. Brucella spleen replication profiles are highly reproducible and course in four phases: i), onset or spleen colonization (first 48 h); ii), acute phase, from the third day to the time when bacteria reach maximal numbers; iii), chronic steady phase, where bacterial numbers plateaus; and iv), chronic declining phase, during which brucellae are eliminated. This pattern displays clear physiopathological signs and is sensitive to small virulence variations, making possible to assess attenuation when fully virulent bacteria are used as controls. Similarly, immunity studies using mice with known defects are possible. Mutations affecting INF-γ, TLR9, Myd88, Tγδ and TNF-β favor Brucella replication; whereas IL-1β, IL-18, TLR4, TLR5, TLR2, NOD1, NOD2, GM-CSF, IL/17r, Rip2, TRIF, NK or Nramp1 deficiencies have no noticeable effects. Splenomegaly development is also useful: it correlates with IFN-γ and IL-12 levels and with Brucella strain virulence. The genetic background is also important: Brucella-resistant mice (C57BL) yield lower splenic bacterial replication and less splenomegaly than susceptible breeds. When inoculum is increased, a saturating dose above which bacterial numbers per organ do not augment, is reached. Unlike many gram-negative bacteria, lethal doses are large (≥ 108 bacteria/mouse) and normally higher than the saturating dose. Persistence is a useful virulence/attenuation index and is used in vaccine (Residual Virulence) quality control. Vaccine candidates are also often tested in mice by determining splenic Brucella numbers after challenging with appropriate virulent brucellae doses at precise post-vaccination times. Since most live or killed Brucella vaccines provide some protection in mice, controls immunized with reference vaccines (S19 or Rev1) are critical. Finally, mice have been successfully used to evaluate brucellosis therapies. It is concluded that, when used properly, the mouse is a valuable brucellosis model.
Topics: Animals; Brucella; Brucellosis; Disease Models, Animal; Humans; Mice; Virulence
PubMed: 22500859
DOI: 10.1186/1297-9716-43-29 -
Journal of Infection in Developing... Jan 2023Brucellosis is an infectious disease caused by direct contact with infected animals or animal products contaminated with Brucella. Brucella is a Gram-negative aerobic...
INTRODUCTION
Brucellosis is an infectious disease caused by direct contact with infected animals or animal products contaminated with Brucella. Brucella is a Gram-negative aerobic coccobacillus that infects different types of animals and is considered to be an important zoonotic disease.
METHODOLOGY
Brucella were isolated from blood samples and identified following biochemical tests and agglutination with A and M monospecific antisera. Furthermore, Brucella antibody titers of the tested sera were obtained by the microtiter agglutination method (MAM).
RESULTS
The main Brucella species isolated in Oman was B. melitensis. However, in countries bordering Oman and their neighboring countries, both B. melitensis and B. abortus have been isolated and identified. A total of 412 human patients with suspected cases of brucellosis were admitted to the Department of Communicable Disease Surveillance and Control in the Dhofar Governorate for diagnosis and treatment. During the year 2015, a total of 343 human cases were positively diagnosed with brucellosis in the Dhofar Governorate. During the years 2015 to 2019, a total of 10,492 animals were examined in different Governorates of Oman for brucellosis. The results indicated that 1161 (11%) animals were serologically positive for brucellosis.
CONCLUSIONS
The results of this study confirmed that Brucella melitensis is the main species responsible for human brucellosis in Oman. It was not surprising that the Dhofar Governorate exhibited a high percentage of infected patients since it is culturally acceptable to drink raw camel milk (unpasteurized), unlike cow milk which is pasteurized.
Topics: Animals; Female; Cattle; Humans; Oman; Brucellosis; Brucella melitensis; Epidemiologic Studies; Serum
PubMed: 36795918
DOI: 10.3855/jidc.17286 -
Revue Scientifique Et Technique... Apr 2013Although relatively effective diagnostic tests for brucellosis have been in existence for more than 100 years, it remains a serious, embedded and also a re-emerging... (Review)
Review
Although relatively effective diagnostic tests for brucellosis have been in existence for more than 100 years, it remains a serious, embedded and also a re-emerging disease in many parts of the globe. There are many factors besides suboptimal diagnosis that impede the complete and sustained eradication of animal brucellosis. In this review a case for the continued improvement of diagnostic methods is made through identifying existing shortcomings and considering what impact these have upon control and eradication. The focus is on developments in immunodiagnostics as these seem more likely to yield the pragmatic solutions needed. Moreover, developments in DNA detection methods have been neatly and recently reviewed elsewhere. This article reviews issues such as test cost, mobility, sensitivity and specificity. Advances in low-cost materials, high-throughput testing, assay multiplexing and the quantification of pen-side tests are described and their relevance to disease control considered. Poor test specificity when resolving positive serology, due to infection with cross-reactive bacteria and vaccination with smooth Brucella strains, is also an impediment to efficient disease eradication. A case for the development of novel discrete epitope antigens to address this is presented alongside in silico methods of selection and tools that enable increased analytical sensitivity that may be required to detect relatively low, but potentially significant, analytes. References have been drawn from the study of brucellosis wherever possible. However, in some cases new technological developments worthy of discussion have been included via the use of pertinent alternative examples. In conclusion, despite developments and innovations the classical serological tests seem under no imminent danger of mass extinction but there is potential for significant improvement and supplementation.
Topics: Animals; Animals, Wild; Brucellosis; Immunologic Tests; Livestock; Sensitivity and Specificity
PubMed: 23837374
DOI: 10.20506/rst.32.1.2205 -
Emerging Infectious Diseases 1997Brucellosis remains a major zoonosis worldwide. Although many countries have eradicated Brucella abortus from cattle, in some areas Brucella melitensis has emerged as a... (Review)
Review
Brucellosis remains a major zoonosis worldwide. Although many countries have eradicated Brucella abortus from cattle, in some areas Brucella melitensis has emerged as a cause of infection in this species as well as in sheep and goats. Despite vaccination campaigns with the Rev 1 strain, B. melitensis remains the principal cause of human brucellosis. Brucella suis is also emerging as an agent of infection in cattle, thus extending its opportunities to infect humans. The recent isolation of distinctive strains of Brucella from marine mammals has extended its ecologic range. Molecular genetic studies have demonstrated phylogenetic affiliation to Agrobacterium, Phyllobacterium, Ochrobactrum, and Rhizobium. Polymerase chain reaction and gene probe development may provide more effective typing methods. Pathogenicity is related to production of lipopolysaccharides containing a poly N-formyl perosamine O chain, CuZn superoxide dismutase, erythrlose phosphate dehydrogenase, stress-induced proteins related to intracellular survival, and adenine and guanine monophosphate inhibitors of phagocyte functions. Protective immunity is conferred by antibody to lipopolysaccharide and T-cell-mediated macrophage activation triggered by protein antigens. Diagnosis still centers on isolation of the organism and serologic test results, especially enzyme immunoassay, which is replacing other methods. Polymerase chain reaction is also under evaluation. Therapy is based on tetracyclines with or without rifampicin, aminoglycosides, or quinolones. No satisfactory vaccines against human brucellosis are available, although attenuated purE mutants appear promising.
Topics: Animals; Antigens, Bacterial; Brucella; Brucellosis; Cattle; Humans
PubMed: 9204307
DOI: 10.3201/eid0302.970219 -
Revue Scientifique Et Technique... Dec 2012Caprine and ovine brucellosis is one of the most serious and complex animal health problems faced by Veterinary Services in countries where the disease is endemic.... (Review)
Review
Caprine and ovine brucellosis is one of the most serious and complex animal health problems faced by Veterinary Services in countries where the disease is endemic. Various geographical factors and the nature of the disease itself influence its epidemiology, encouraging widespread distribution and, at the same time, impeding the ability of animal health programmes to prevent, control and eradicate it. Although strategies against brucellosis have traditionally been based on two specific tools (namely, vaccination of the at-risk population and testing and slaughter of animals which are suspected of or test positive for the disease), other complementary tools of a technical or administrative nature should also be considered. Experience in the European Union has shown that these tools are necessary to guarantee sustainable progress and success against this disease. However, these complementary tools have not always received sufficient attention during the strategic planning and subsequent implementation of animal health programmes, with consequent reductions in efficiency. The aim of this article is to review these complementary tools, in order to facilitate their adoption and use by official Veterinary Services, according to the resources available.
Topics: Animal Husbandry; Animal Identification Systems; Animals; Brucellosis; Disease Outbreaks; European Union; Goat Diseases; Goats; Guideline Adherence; Health Status; Registries; Sheep; Sheep Diseases; Transportation
PubMed: 23520752
DOI: 10.20506/rst.31.3.2174 -
Travel Medicine and Infectious Disease 2023Brucellosis is a common and neglected zoonotic infectious disease worldwide caused by Brucella. However, transboundary transmissions among countries, particularly those...
OBJECTIVE
Brucellosis is a common and neglected zoonotic infectious disease worldwide caused by Brucella. However, transboundary transmissions among countries, particularly those with high incidences, are seldom investigated. In the present study, by taking China and Mongolia as examples, we aim to identify transboundary transmission risk and driving factors of brucellosis along borders.
METHODS
167 brucellosis outbreak locations along the border between China and Mongolia were collected. Wildlife distribution and cross-border activities were mapped. Maximum entropy approach modeling was conducted to predict the potential risk of prevalence of brucellosis with meteorological factors, geographical environment, economic development, living habits et al. The accuracy of the models was assessed by the area under the receiver operating characteristic (ROC) curve (AUC), Kappa test, and correctly classified instances (CCI).
RESULTS
The spatial model performed excellent predictive performance with the predictor variables of soils, pastures, goat density, mean precipitation of the wettest month, temperature seasonality, and population density, which with the contribution and permutation important in 27.2 %, 31.9; 23.3 %, 6.8; 18.0 %, 17.2; 11.2 %, 18.1; 10. 3 %, 15.2; 10.0 %, 10.8. The calculated AUC, SD, Kappa, and CCI are 0.870, 0.001, 0.882, and 0.883, respectively. The distribution map of brucellosis showed high-risk areas along the borders.
CONCLUSIONS
Our study identified high-risk areas and the driving effect of brucellosis along the borders between China and Mongolia. Moreover, there is the possibility of cross-border wildlife activities in high-risk areas, which increases the risk of cross-border brucellosis transmission. The funding provides clues for cooperative prevention and control of brucellosis by reducing transboundary transmission.
Topics: Animals; Mongolia; Brucellosis; Zoonoses; Disease Outbreaks; China; Goats
PubMed: 37813322
DOI: 10.1016/j.tmaid.2023.102648 -
Revista Da Sociedade Brasileira de... 2022
Topics: Humans; Brucellosis; Liver Abscess
PubMed: 36417621
DOI: 10.1590/0037-8682-0093-2022