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Sotolongo-Rodríguez D, Gomez-Flores R, Navarro-Soto MC, Arellano-Reynoso B, Tamez-Guerra P, Ramírez-Pfeiffer C. Evaluation of the Fluorescence Polarization Assay for the Diagnosis of Brucellosis in Goat Milk. Vet Sci 2022; 9:vetsci9060303. [PMID: 35737355 PMCID: PMC9229069 DOI: 10.3390/vetsci9060303] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 06/09/2022] [Accepted: 06/16/2022] [Indexed: 11/23/2022] Open
Abstract
The milk ring test is a detection assay for antibodies against Brucella in bovine milk. It has good sensitivity but tends to give false positive results. In this study, we standardized the application of the fluorescence polarization assay (FPA) for the detection of antibodies against B.melitensis in goat milk. We obtained negative serum and milk samples from healthy goat flocks in the northern zone of Nuevo León. Positive milk and negative, weak, and strong controls were obtained by mixing volumes of positive control serum with negative control milk. Milk samples were treated with citric acid, after which an FPA was performed. Results were then compared with the Rose Bengal test and the FPA in serum. Milk treatment allowed the quantification of antibodies in samples. Significant differences were found between the 2%, 4%, and 6% groups, compared with the control group (F3, 67 = 17.45, p < 0.0001) but not between the 2% and 4% groups (p = 0.0718). The cut-off value was 74.1 mP, with a sensitivity (Se) of 95% and a specificity (Sp) of 100%. Se and Sp values in field milk samples were 84% and 74.55%, respectively. Despite the FPA test on milk samples showed lower Se and Sp than the FPA test on serum samples, its cutoff may be adjusted. It may be recommended as a screening test in goat milk and become useful for the control and eradication of the disease.
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Affiliation(s)
- Dianelys Sotolongo-Rodríguez
- Departamento de Microbiología e Inmunología, Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, San Nicolás de los Garza C.P. 66450, Nuevo León, Mexico; (D.S.-R.); (P.T.-G.)
| | - Ricardo Gomez-Flores
- Departamento de Microbiología e Inmunología, Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, San Nicolás de los Garza C.P. 66450, Nuevo León, Mexico; (D.S.-R.); (P.T.-G.)
- Correspondence: (R.G.-F.); (C.R.-P.)
| | - Magda Celina Navarro-Soto
- Departamento de Inmunología, Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma de Nuevo León, Escobedo C.P. 66054, Nuevo León, Mexico;
| | - Beatriz Arellano-Reynoso
- Departamento de Microbiología e Inmunología, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, Coyoacán C.P. 04510, Ciudad de México, Mexico;
| | - Patricia Tamez-Guerra
- Departamento de Microbiología e Inmunología, Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, San Nicolás de los Garza C.P. 66450, Nuevo León, Mexico; (D.S.-R.); (P.T.-G.)
| | - Carlos Ramírez-Pfeiffer
- Coordinación de Investigación Institucional, Universidad México Americana del Norte, Ciudad Reynosa C.P. 88640, Tamaulipas, Mexico
- Correspondence: (R.G.-F.); (C.R.-P.)
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Helms AB, Balogh O, Franklin-Guild R, Lahmers K, Caswell CC, Cecere JT. Presumptive Identification of Smooth Brucella Strain Antibodies in Canines. Front Vet Sci 2021; 8:697479. [PMID: 34307536 PMCID: PMC8295921 DOI: 10.3389/fvets.2021.697479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Accepted: 06/10/2021] [Indexed: 11/17/2022] Open
Abstract
Brucellosis is a zoonotic disease caused by a Gram-negative coccobacillus. There are four Brucella strains of zoonotic importance in our domestic species, subdivided by their culture phenotypes: Brucella abortus (B. abortus), B. melitensis, B. suis (smooth strains) and B. canis (rough strain). Dogs can serve as hosts for all four of the zoonotic strains; however, routine serologic testing in dogs has been limited to the identification of B. canis antibodies. The aim of our study was to identify smooth Brucella strain antibodies in canines. We hypothesize that the Brucella abortus Fluorescence Polarization Assay would be successful in identifying smooth Brucella strain antibodies in canines. Ninety-five dogs, including forty-five hog hunting dogs were screened for circulating antibodies to any of the four zoonotic strains of the bacteria utilizing a combination of Canine Brucella Slide Agglutination Test (CBSA), Brucella canis Agar Gel Immunodiffusion II test (AGIDII), Brucella abortus Card Agglutination Test (BCA), and the Brucella abortus Fluorescence Polarization Assay (FPA). Test interpretation results yielded a 0% (0/95) smooth Brucella strain seropositivity rate, with 2% (2/95) of dogs yielding inconclusive rough Brucella strain serology results (0–2% rough strain seropositivity rate). Additionally, a retrospective portion of the study was performed to identify sera containing circulating antibodies to any of the smooth strains of Brucella by testing previously banked canine serum samples stored at Cornell's Veterinary Diagnostic Laboratory from 2018 to 2019 via Brucella abortus FPA. Of the 769 serum samples tested, 13/769 (1.7%) yielded an inconclusive result, 725/769 (94.2%) were negative, 30/769 (4%) yielded a positive FPA test result, and 1/769 (0.1%) had to be excluded due to insufficient sample remaining to perform the diagnostic test. Of the 30 FPA positive canine serum samples, 97% (29/30) also tested positive on the CBSA test. Additionally, there was a statistically significant (p < 0.0001) likelihood of altered (spayed/neutered) and mixed breed dogs to be FPA positive when compared to intact, purebred dogs, respectively.
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Affiliation(s)
- Alyssa B Helms
- Department of Small Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, , Blacksburg, VA, United States
| | - Orsolya Balogh
- Department of Small Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, , Blacksburg, VA, United States
| | - Rebecca Franklin-Guild
- Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, United States
| | - Kevin Lahmers
- Department of Biomedical Sciences and Pathobiology, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA, United States
| | - Clayton C Caswell
- Department of Biomedical Sciences and Pathobiology, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA, United States
| | - Julie T Cecere
- Department of Small Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, , Blacksburg, VA, United States
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3
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Olsen SC, Crawford LS, Fuentes A, Kostovic M, Boggiatto PM. Influence of species of negative control sera on results of a brucellosis fluorescence polarization assay. J Vet Diagn Invest 2020; 33:67-72. [PMID: 33213290 DOI: 10.1177/1040638720970888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Abstract
We evaluated serologic responses of cattle, bison, elk, and swine representing negative control, early vaccination (4-8 wk), late vaccination (21-28 wk) or booster vaccination, early after-experimental challenge (2-4 wk), and late after-experimental challenge (8-21 wk), in a brucellosis fluorescence polarization assay (FPA; n = 10 sera per species per treatment) using negative control sera from cattle, bison, elk, and swine (n = 5 per species). Sera from cattle shedding Brucella abortus strain RB51 in milk were also evaluated against the 20 negative control sera. The species of negative control sera used in the FPA could increase (p < 0.05) delta millipolarization (mP; delta mP = sample mP - negative control mP) results. In general, the species of negative control sera did not alter the interpretation of FPA results in control, vaccinated, or infected animals. Even after repeated RB51 vaccinations in bison, cattle, or elk, or in cattle shedding RB51 in milk, serologic results from the FPA remained negative. Species differences in FPA results were noted; elk developed robust humoral responses very quickly after infection that resulted in strong positive FPA results. In cattle and bison, humoral responses appeared to develop over a longer period of time, and greater delta mP values were detected at later times after infection. Sensitivity of the FPA for detecting infected animals was greatest for elk in early challenge samples and bison in late challenge samples. Our data suggest that species of origin of negative control sera does not influence interpretation of the FPA in natural hosts of Brucella abortus.
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Affiliation(s)
- Steven C Olsen
- Bacterial Diseases of Livestock Research Unit, National Animal Disease Center, Agricultural Research Service, U.S. Department of Agriculture, Ames, IA
| | - Lauren S Crawford
- Bacterial Diseases of Livestock Research Unit, National Animal Disease Center, Agricultural Research Service, U.S. Department of Agriculture, Ames, IA
| | - Antonio Fuentes
- Montana Department of Livestock, Montana Veterinary Diagnostic Laboratory, Bozeman, MT
| | | | - Paola M Boggiatto
- Bacterial Diseases of Livestock Research Unit, National Animal Disease Center, Agricultural Research Service, U.S. Department of Agriculture, Ames, IA
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Barbuddhe SB, Vergis J, Rawool DB. Immunodetection of bacteria causing brucellosis. METHODS IN MICROBIOLOGY 2020. [DOI: 10.1016/bs.mim.2019.11.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Triple Immunochromatographic System for Simultaneous Serodiagnosis of Bovine Brucellosis, Tuberculosis, and Leukemia. BIOSENSORS-BASEL 2019; 9:bios9040115. [PMID: 31569488 PMCID: PMC6956381 DOI: 10.3390/bios9040115] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2019] [Revised: 09/24/2019] [Accepted: 09/26/2019] [Indexed: 11/17/2022]
Abstract
An immunochromatographic test system has been developed for the simultaneous rapid multiplex serodiagnostics of bovine brucellosis, tuberculosis, and leukemia. The test system is based on the use of a conjugate of gold nanoparticles with the chimeric protein Cysteine-A/G and three analytical zones with immobilized pathogen antigens: Brucella abortus lipolysaccharide, recombinant proteins MPB64 and MPB83-MPB63 of Mycobacterium bovis, and recombinant protein p24 of the bovine leukemia virus. Prototypes of the test system were tested on 98 samples of sera from healthy and infected animals. The diagnostic sensitivity of the developed test system was 92% for brucellosis, 92% for tuberculosis, and 96% for leukemia. False positive test results were not observed.
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Falzon LC, Traoré S, Kallo V, Assamoi JB, Bonfoh B, Schelling E. Evaluation of the Fluorescence Polarization Assay as a Rapid On-Spot Test for Ruminant Brucellosis in Côte d'Ivoire. Front Vet Sci 2019; 6:287. [PMID: 31552280 PMCID: PMC6746889 DOI: 10.3389/fvets.2019.00287] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Accepted: 08/13/2019] [Indexed: 12/30/2022] Open
Abstract
Brucellosis is a zoonosis of economic and public health concern. While most diagnostic tests for brucellosis can only be performed in the laboratory, the Fluorescence Polarization Assay (FPA) was developed as a rapid point-of-care field test. This pilot project aimed to validate the use of FPA for rapid diagnosis of ruminant brucellosis on the field, and to compare the FPA performance with that of the more commonly used Rose Bengal Test (RBT). Blood samples were first collected from ruminants in a livestock market, and later from a nearby slaughterhouse in Port Bouët, Abidjan, Côte d'Ivoire. Samples collected in the livestock market were processed and tested with the FPA in a central laboratory, while samples collected in the slaughterhouse were processed immediately and the FPA was performed on site. To assess the FPA intra-test agreement, a portion of the serum samples tested at the slaughterhouse were re-tested with the FPA in the laboratory later the same day. To assess inter-test agreement, all serum samples were retested with the RBT. A total of 232 samples were tested with the FPA, 106 and 126 from the livestock market and slaughterhouse, respectively. Of these, 26 tested positive and 39 were doubtful for brucellosis. The FPA was repeated on 28 of the samples collected at the slaughterhouse, and comparison of results indicated a moderate intra-test agreement (Kappa = 0.41). The agreement improved when the doubtful category was treated as negative (Kappa = 0.65), and when cattle were excluded (Kappa = 0.56 to 0.61). The RBT was performed on 229 samples, and of these 10 tested positive. A comparison of FPA and RBT results indicated poor agreement (Kappa = 0.00); this improved to slight when only samples taken at the livestock market and tested in the laboratory were considered (Kappa = 0.14). The FPA did not perform well in tropical field conditions, possibly due to the high ambient temperatures in the slaughterhouse. Moreover, a difference in performance was noted in relation to the species tested, whereby the FPA seemed to perform better on sheep and goat samples, compared to cattle samples. These findings highlight that further adjustments are needed before implementing the FPA on the field.
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Affiliation(s)
- Laura C Falzon
- Institute of Infection and Global Health, University of Liverpool, Liverpool, United Kingdom.,International Livestock Research Institute, Nairobi, Kenya.,Veterinary Public Health Institute, University of Bern, Bern, Switzerland
| | - Sylvain Traoré
- Université Pelefero Gon Coulibaly de Korhogo, Korhogo, Côte d'Ivoire.,Centre Suisse de Recherches Scientifiques en Côte d'Ivoire, Abidjan, Côte d'Ivoire
| | - Vessaly Kallo
- Direction des Services Vétérinaires de Côte d'Ivoire, Abidjan, Côte d'Ivoire
| | | | - Bassirou Bonfoh
- Centre Suisse de Recherches Scientifiques en Côte d'Ivoire, Abidjan, Côte d'Ivoire.,Swiss Tropical and Public Health Institute, Basel, Switzerland
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Tomaselli M, Elkin B, Kutz S, Harms NJ, Nymo HI, Davison T, Leclerc LM, Branigan M, Dumond M, Tryland M, Checkley S. A Transdisciplinary Approach to Brucella in Muskoxen of the Western Canadian Arctic 1989-2016. ECOHEALTH 2019; 16:488-501. [PMID: 31414318 PMCID: PMC6858907 DOI: 10.1007/s10393-019-01433-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 07/10/2019] [Accepted: 07/12/2019] [Indexed: 05/30/2023]
Abstract
Brucella serostatus was evaluated in 3189 muskoxen sampled between 1989 and 2016 from various locations of the Canadian Arctic archipelago and mainland, near the communities of Sachs Harbour and Ulukhaktok, Northwest Territories, and Cambridge Bay and Kugluktuk, Nunavut. Brucella antibodies were found only in muskoxen sampled around Cambridge Bay, both on southern Victoria Island and on the adjacent mainland (Kent Peninsula). Consistent with participatory epidemiology data documented from local harvesters describing increased Brucella-like syndromes (swollen joints and lameness) and a decreased proportion of juveniles, the apparent Brucella seroprevalence in the sampled muskoxen of the Cambridge Bay area increased from 0.9% (95% CI 0.3-2.1) in the period of 1989-2001 to 5.6% (95% CI 3.3-8.9) in 2010-2016. The zoonotic bacteria Brucella suis biovar 4 was also cultured from tissues of muskoxen sampled on Victoria Island near Ulukhaktok in 1996 (n = 1) and Cambridge Bay in 1998, 2014, and 2016 (n = 3). Overall, our data demonstrate that B. suis biovar 4 is found in muskoxen that are harvested for food and by guided hunts on Victoria Island and Kent Peninsula, adding an important public health dimension to this study. Robust participatory epidemiology data on muskox health and diseases greatly enhanced the interpretation of our Cambridge Bay data and, combined with the serological and microbiological data, provide compelling evidence that the prevalence of B. suis biovar 4 has increased in this area since the late 1990s. This study enhances the available knowledge on Brucella exposure and infection in muskoxen and provides an example of how scientific knowledge and local knowledge can work together to better understand disease status in wildlife.
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Affiliation(s)
- Matilde Tomaselli
- Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada.
- Canadian High Arctic Research Station, Polar Knowledge Canada, Cambridge Bay, NU, Canada.
| | - Brett Elkin
- Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada
- Department of Environment and Natural Resources, Government of Northwest Territories, Yellowknife, Inuvik, NT, Canada
| | - Susan Kutz
- Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada
- Canadian Wildlife Health Cooperative, University of Calgary, Calgary, AB, Canada
| | - N Jane Harms
- Department of Environment, Animal Health Unit, Yukon Government, Whitehorse, YT, Canada
| | - H Ingebjørg Nymo
- Research Food Safety and Animal Health, The Norwegian Veterinary Institute, Tromsø, Norway
| | - Tracy Davison
- Department of Environment and Natural Resources, Government of Northwest Territories, Yellowknife, Inuvik, NT, Canada
| | | | - Marsha Branigan
- Department of Environment and Natural Resources, Government of Northwest Territories, Yellowknife, Inuvik, NT, Canada
| | - Mathieu Dumond
- Department of Environment, Government of Nunavut, Kugluktuk, NU, Canada
| | - Morten Tryland
- Department of Arctic and Marine Biology, Research Group for Arctic Infection Biology, UiT - The Arctic University of Norway, Tromsø, Norway
| | - Sylvia Checkley
- Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada
- Alberta Provincial Laboratory for Public Health, Calgary, AB, Canada
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Laboratory Diagnostic Procedures for Human Brucellosis: An Overview of Existing Approaches. Jundishapur J Microbiol 2019. [DOI: 10.5812/jjm.91200] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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EFFECTS OF BRUCELLOSIS SEROLOGIC STATUS ON PHYSIOLOGY AND BEHAVIOR OF ROCKY MOUNTAIN ELK ( CERVUS CANADENSIS NELSONI) IN SOUTHWESTERN MONTANA, USA. J Wildl Dis 2018; 55:304-315. [PMID: 30277828 DOI: 10.7589/2018-01-011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Brucellosis, caused by bacteria in the genus Brucella, is an infectious zoonosis affecting animals and humans worldwide. Free-ranging Rocky Mountain elk ( Cervus canadensis nelsoni) and bison ( Bison bison) in the Greater Yellowstone Ecosystem (areas of southwestern Montana, eastern Idaho, and northwestern Wyoming, US) are the self-sustaining reservoirs of bovine brucellosis ( Brucella abortus) and elk are considered the primary source of livestock infections. It has been hypothesized that Brucella-exposed elk might have different physiologic status (pregnancy rates and body condition) and migration behaviors than would healthy elk. Here we tested the effects of brucellosis serologic status on pregnancy rates and winter ingesta free body fat of 100 female elk in southwestern Montana. We also evaluated the effects of serologic status on two characteristics of spring migration behavior, migration types (migrant, mixed migrant, resident, disperser, nomad, and undetermined type) and timing (start and end dates and duration). The migration behaviors were quantified using a model-driven approach based on the relative net squared displacement. We detected a significant difference (P=0.003) in pregnancy rates between seropositive and seronegative elk, with about a 30% drop in seropositive individuals. However, we did not detect differences in body fat between seropositive and seronegative elk or differences in either migration type or timing of spring migration. These results confirmed that the major effect of brucellosis in free-ranging elk is associated with reproduction.
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Kang D, Parolo C, Sun S, Ogden NE, Dahlquist FW, Plaxco KW. Expanding the Scope of Protein-Detecting Electrochemical DNA "Scaffold" Sensors. ACS Sens 2018; 3:1271-1275. [PMID: 29877078 DOI: 10.1021/acssensors.8b00311] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The ability to measure the levels of diagnostically relevant proteins, such as antibodies, directly at the point of care could significantly impact healthcare. Thus motivated, we explore here the E-DNA "scaffold" sensing platform, a rapid, convenient, single-step means to this end. These sensors comprise a rigid nucleic acid "scaffold" attached via a flexible linker to an electrode and modified on its distal end with a redox reporter and a protein binding "recognition element". The binding of a targeted protein reduces the efficiency with which the redox reporter approaches the electrode, resulting in an easily measured signal change when the sensor is interrogated voltammetrically. Previously we have demonstrated scaffold sensors employing a range of low molecular weight haptens and linear peptides as their recognition elements. Expanding on this here we have characterized sensors employing much larger recognition elements (up to and including full length proteins) in order to (1) define the range of recognition elements suitable for use in the platform; (2) better characterize the platform's signaling mechanism to aid its design and optimization; and (3) demonstrate the analytical performance of sensors employing full-length proteins as recognition elements. In doing so we have enlarged the range of molecular targets amenable to this rapid and convenient sensing platform.
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11
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A systematic review of current immunological tests for the diagnosis of cattle brucellosis. Prev Vet Med 2018; 151:57-72. [PMID: 29496108 DOI: 10.1016/j.prevetmed.2018.01.005] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 11/22/2017] [Accepted: 01/16/2018] [Indexed: 12/20/2022]
Abstract
Brucellosis is a worldwide extended zoonosis with a heavy economic and public health impact. Cattle, sheep and goats are infected by smooth Brucella abortus and Brucella melitensis, and represent a common source of the human disease. Brucellosis diagnosis in these animals is largely based on detection of a specific immunoresponse. We review here the immunological tests used for the diagnosis of cattle brucellosis. First, we discuss how the diagnostic sensitivity (DSe) and specificity (DSp), balance should be adjusted for brucellosis diagnosis, and the difficulties that brucellosis tests specifically present for the estimation of DSe/DSp in frequentistic (gold standard) and Bayesian analyses. Then, we present a systematic review (PubMed, GoogleScholar and CABdirect) of works (154 out of 991; years 1960-August 2017) identified (by title and Abstract content) as DSe and DSp studies of smooth lipopolysaccharide, O-polysaccharide-core, native hapten and protein diagnostic tests. We summarize data of gold standard studies (n = 23) complying with strict inclusion and exclusion criteria with regards to test methodology and definition of the animals studied (infected and S19 or RB51 vaccinated cattle, and Brucella-free cattle affected or not by false positive serological reactions). We also discuss some studies (smooth lipopolysaccharide tests, protein antibody and delayed type hypersensitivity [skin] tests) that do not meet the criteria and yet fill some of the gaps in information. We review Bayesian studies (n = 5) and report that in most cases priors and assumptions on conditional dependence/independence are not coherent with the variable serological picture of the disease in different epidemiological scenarios and the bases (antigen, isotype and immunoglobulin properties involved) of brucellosis tests, practical experience and the results of gold standard studies. We conclude that very useful lipopolysaccharide (buffered plate antigen and indirect ELISA) and native hapten polysaccharide and soluble protein tests exist, provided they are applied taking into account the means available and the epidemiological contexts of this disease: i) mass vaccination; ii) elimination based on vaccination combined with test-and-slaughter; and iii) surveillance and existence of false positive serological reactions. We also conclude that the insistence in recent literature on the lack of usefulness of all smooth lipopolysaccharide or native hapten polysaccharide tests in areas where S19 vaccination is implemented is a misinterpretation that overlooks scientific and practical evidence.
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Higgins JL, Gonzalez-Juarrero M, Bowen RA. Evaluation of shedding, tissue burdens, and humoral immune response in goats after experimental challenge with the virulent Brucella melitensis strain 16M and the reduced virulence vaccine strain Rev. 1. PLoS One 2017; 12:e0185823. [PMID: 29028813 PMCID: PMC5640220 DOI: 10.1371/journal.pone.0185823] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Accepted: 09/20/2017] [Indexed: 12/03/2022] Open
Abstract
Brucella melitensis is the causative agent of brucellosis in small ruminants and is of considerable economic and public health importance in many countries worldwide. The control of disease in humans depends on the control of disease in livestock; however, few counties with endemic B. melitensis infection have been able to successfully eradicate this pathogen. This underscores the need for further research on the pathogenesis of both virulent and vaccine strains of B. melitensis in the small ruminant host. The aim of the present study was to characterize clinical effects, tissue colonization, shedding, and humoral immune response following B. melitensis infection in goats. Both virulent (16M) and reduced virulence (Rev. 1) strains of B. melitensis were studied. Pregnant goats were infected at 11–14 weeks of gestation with 8 x 106 or 8 x 107 CFU of B. melitensis. Infection of goats with B. melitensis 16M resulted in an 86% abortion rate. This strain disseminated widely in pregnant does post-infection with none of the 15 sampled tissues spared from colonization. Importantly, we report the first isolation of B. melitensis from muscle tissue in ruminants. Pathogenesis of Rev. 1 infection was variable with two does showing minimal colonization and one doe exhibiting disease similar to that of animals infected with fully virulent 16M. Shedding of B. melitensis in milk occurred in all 16M- and Rev. 1- infected goats. In pregnant animals challenged with virulent B. melitensis, median time to seroconversion was 21 days; however, 2 animals did not seroconvert until after abortion.
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Affiliation(s)
- Jennifer L Higgins
- Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado, United States of America
| | - Mercedes Gonzalez-Juarrero
- Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado, United States of America
| | - Richard A Bowen
- Department of Biomedical Sciences, Colorado State University, Fort Collins, Colorado, United States of America
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Kang D, Sun S, Kurnik M, Morales D, Dahlquist FW, Plaxco KW. New Architecture for Reagentless, Protein-Based Electrochemical Biosensors. J Am Chem Soc 2017; 139:12113-12116. [PMID: 28789522 DOI: 10.1021/jacs.7b05953] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Here we demonstrate a new class of reagentless, single-step sensors for the detection of proteins and peptides that is the electrochemical analog of fluorescence polarization (fluorescence anisotropy), a versatile optical approach widely employed to this same end. Our electrochemical sensors consist of a redox-reporter-modified protein (the "receptor") site-specifically anchored to an electrode via a short, flexible polypeptide linker. Interaction of the receptor with its binding partner alters the efficiency with which the reporter approaches the electrode surface, thus causing a change in redox current upon voltammetric interrogation. As our first proof-of-principle we employed the bacterial chemotaxis protein CheY as our receptor. Interaction with either of CheY's two binding partners, the P2 domain of the chemotaxis kinase, CheA, or the 16-residue "target region" of the flagellar switch protein, FliM, leads to easily measurable changes in output current that trace Langmuir isotherms within error of those seen in solution. Phosphorylation of the electrode-bound CheY decreases its affinity for CheA-P2 and enhances its affinity for FliM in a manner likewise consistent with its behavior in solution. As expected given the proposed sensor signaling mechanism, the magnitude of the binding-induced signal change depends on the placement of the redox reporter on the receptor. Following these preliminary studies with CheY, we also developed and characterized additional sensors aimed at the detection of specific antibodies using the relevant protein antigens as the receptor. These exhibit excellent detection limits for their targets without the use of reagents or wash steps. This novel, protein-based electrochemical sensing architecture provides a new and potentially promising approach to sensors for the single-step measurement of specific proteins and peptides.
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Affiliation(s)
- Di Kang
- Department of Chemistry and Biochemistry, ‡Interdepartmental Program in Biomolecular Science and Engineering, University of California, Santa Barbara , Santa Barbara, California 93106, United States
| | - Sheng Sun
- Department of Chemistry and Biochemistry, ‡Interdepartmental Program in Biomolecular Science and Engineering, University of California, Santa Barbara , Santa Barbara, California 93106, United States
| | - Martin Kurnik
- Department of Chemistry and Biochemistry, ‡Interdepartmental Program in Biomolecular Science and Engineering, University of California, Santa Barbara , Santa Barbara, California 93106, United States
| | - Demosthenes Morales
- Department of Chemistry and Biochemistry, ‡Interdepartmental Program in Biomolecular Science and Engineering, University of California, Santa Barbara , Santa Barbara, California 93106, United States
| | - Frederick W Dahlquist
- Department of Chemistry and Biochemistry, ‡Interdepartmental Program in Biomolecular Science and Engineering, University of California, Santa Barbara , Santa Barbara, California 93106, United States
| | - Kevin W Plaxco
- Department of Chemistry and Biochemistry, ‡Interdepartmental Program in Biomolecular Science and Engineering, University of California, Santa Barbara , Santa Barbara, California 93106, United States
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More S, Bøtner A, Butterworth A, Calistri P, Depner K, Edwards S, Garin-Bastuji B, Good M, Gortázar Schmidt C, Michel V, Miranda MA, Nielsen SS, Raj M, Sihvonen L, Spoolder H, Stegeman JA, Thulke HH, Velarde A, Willeberg P, Winckler C, Baldinelli F, Broglia A, Verdonck F, Beltrán Beck B, Kohnle L, Morgado J, Bicout D. Assessment of listing and categorisation of animal diseases within the framework of the Animal Health Law (Regulation (EU) No 2016/429): infection with Brucella abortus, B. melitensis and B. suis. EFSA J 2017; 15:e04889. [PMID: 32625554 PMCID: PMC7009888 DOI: 10.2903/j.efsa.2017.4889] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
The infection with Brucella abortus, Brucella melitensis and Brucella suis has been assessed according to the criteria of the Animal Health Law (AHL), in particular criteria of Article 7 on disease profile and impacts, Article 5 on the eligibility of the infection with B. abortus, B. melitensis and B. suis to be listed, Article 9 for the categorisation of the infection with B. abortus, B. melitensis and B. suis according to disease prevention and control rules as in Annex IV and Article 8 on the list of animal species related to the infection with B. abortus, B. melitensis and B. suis. The assessment has been performed following a methodology composed of information collection and compilation, expert judgement on each criterion at individual and, if no consensus was reached before, also at collective level. The output is composed of the categorical answer, and for the questions where no consensus was reached, the different supporting views are reported. Details on the methodology used for this assessment are explained in a separate opinion. According to the assessment performed, the infection with B. abortus, B. melitensis and B. suis can be considered eligible to be listed for Union intervention as laid down in Article 5(3) of the AHL. The disease complies with the criteria as in Sections 2, 3, 4 and 5 of Annex IV of the AHL, for the application of the disease prevention and control rules referred to in points (b), (c), (d) and (e) of Article 9(1). The animal species to be listed for the infection with B. abortus, B. melitensis and B. suis according to Article 8(3) criteria are several mammal species, as indicated in the present opinion.
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Acharya KP, Kaphle K, Shrestha K, Garin Bastuji B, Smits HL. Review of brucellosis in Nepal. Int J Vet Sci Med 2016; 4:54-62. [PMID: 33195685 DOI: 10.1016/j.ijvsm.2016.10.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Revised: 10/21/2016] [Accepted: 10/25/2016] [Indexed: 11/16/2022] Open
Abstract
Brucellosis is an abortifacient zoonotic disease that remains prominent in third world countries like Nepal. Brucellosis poses a public health concern, because its incidence in livestock can present substantial economic and health burdens for herders and health professionals. Several cases of bovine and human brucellosis have been reported and the prevalence is higher among livestock than among humans in Nepal. Lack of awareness, unhealthy food habit, traditional husbandry practices, and a lack of surveillance and immunization have been the major factors in maintaining a vicious cycle of propagation of the disease in human and animals. The aim of this paper is to evaluate the current status of the disease, the mechanism of infection, and pathogenesis, its zoonotic potential, diagnostic advances, treatment regimens, and the preventive measures that can be adopted in managing human brucellosis in under-developed countries such as Nepal.
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Affiliation(s)
- Krishna Prasad Acharya
- Ecole d'Ingenieurs de Purpan, Toulouse, France
- Agriculture and Forestry University (AFU), Rampur, Chitwan, Nepal
- Institute of Agriculture and Animal Science (IAAS), Tribhuvan University (TU), Kathmandu, Nepal
| | - Krishna Kaphle
- Institute of Agriculture and Animal Science (IAAS), Tribhuvan University (TU), Kathmandu, Nepal
| | | | - Bruno Garin Bastuji
- European & International Affairs Department Agence Nationale de Sécurité Sanitaire de l'alimentation, de l'environnement et du travail French Agency for Food, Environmental & Occupational Health & Safety (ANSES)
| | - Henk L Smits
- KIT Biomedical Research, Royal Tropical Institute/Koninklijk Instituut voor de Tropen, Amsterdam, The Netherlands
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Acharya KP, Niroula N, Kaphle K. Review of Brucellosis in Nepal. Epidemiol Health 2016; 38:e2016042. [PMID: 27703129 PMCID: PMC5425907 DOI: 10.4178/epih.e2016042] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Accepted: 09/30/2016] [Indexed: 11/16/2022] Open
Abstract
OBJECTIVES The aim of this paper is to evaluate the current status of the disease, the mechanism of infection, and pathogenesis, its zoonotic potential, diagnostic advances, treatment regimens, and the preventive measures that can be adopted in managing human brucellosis in under-developed countries such as Nepal. METHODS We performed a systematic review of all the available literture through Google Scholar, PubMed, Gideon Informatics, World Health Organization and other legitimate sources. Other secondary informations were collected from the government agencies such as department of livestock services and Ministry of Health. The obtained information was then re-analysed and summarized. RESULTS Few publications have addressed brucellosis in Nepal and most of those publications have focused on bovine brucellosis with sparse information available on brucellosis in humans and small ruminants. Brucella abortus is the most predominant causative agent followed by B. suis. B. abortus is predominant in cattle accounting for a substantial portion of bovine abortion in the country. Lack of awareness, unhealthy food habit, traditional husbandry practices, and a lack of surveillance and immunization have been the major factors in maintaining a vicious cycle of propagation of the disease in human and animals. Unfortunately, nothing has been done to identify the species of Brucella at the biovar level. CONCLUSIONS Although brucellosis has been reported to be endemic in Nepal, neither the distribution nor the economic and public health impact of this disease is well characterized. Robust and well-designed nationwide survey is warranted to assess the prevalence and distribution of disease in livestock and humans. Such data would facilitate the design of appropriate control programmes.
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Affiliation(s)
| | - Nirajan Niroula
- Institute of Agriculture and Animal Science, Tribhuwan University, Chitwan, Nepal
| | - Krishna Kaphle
- Institute of Agriculture and Animal Science, Tribhuwan University, Chitwan, Nepal
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Acharya KP. Brucellosis in Nepal - A Potential Threat to Public Health Professionals. CURRENT HEALTH SCIENCES JOURNAL 2016; 42:396-407. [PMID: 30581595 PMCID: PMC6269619 DOI: 10.12865/chsj.42.04.10] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Accepted: 12/18/2016] [Indexed: 11/18/2022]
Abstract
Brucellosis is a prominent zoonotic disease affecting humans and animals which with the lack of proper diagnosis and treatment remains dangerous in third world countries like Nepal. Currently, Brucellosis poses a public health concern, whose incidences among entire herds of animals can present substantial economic and health burdens for herders and health professionals. Additionally, factors such as close contact with animals, poor animal husbandry, and unhygienic feeding habits can exacerbate the spread of Brucella and related zoonotic agents. In Nepal, serious cases of bovine and even human brucellosis have been reported, although the topic is yet to be extensively reviewed. This paper evaluates the literatures on human and animal brucellosis in Nepal and other countries, with an emphasis on the impact of Brucella outbreaks on public health professionals. Herein, we summarize the current status of the disease, the mechanism of infection, pathogenesis, zoonotic potential, diagnostic advances, treatment regimens, and the preventive measures that can be adopted in managing human brucellosis in under-developed countries such as Nepal.
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Affiliation(s)
- K P Acharya
- Animal Science Instructor,Shree Himganga Higher Secondary School, Ramechhap, Nepal; Institute of Agriculture and Animal Science, Tribhuwan University, Rampur, Chitwan, Nepal
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Sharma HK, Kotwal SK, Singh DK, Malik MA, Kumar A, Rajagunalan, Singh M. Seroprevalence of human brucellosis in and around Jammu, India, using different serological tests. Vet World 2016; 9:742-6. [PMID: 27536036 PMCID: PMC4983126 DOI: 10.14202/vetworld.2016.742-746] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2016] [Accepted: 06/11/2016] [Indexed: 11/30/2022] Open
Abstract
AIM Brucellosis is a disease of zoonotic importance as it affects both human as well as animal's health, and therefore, directly affects animal productivity and human efficiency. Therefore, a study was conducted to estimate the seroprevalence of brucellosis in humans in Jammu and surrounding areas. MATERIALS AND METHODS A total of 121 sera samples from humans occupied with professional related to animals were collected and tested for anti-Brucella antibodies by Rose Bengal plate test (RBPT), modified RBPT (mRBPT), standard tube agglutination test (STAT), and indirect enzyme-linked immunosorbent assay (I-ELISA). Sampling was done keeping in view with the occupation, sex, and age. RESULTS The overall seroprevalence of brucellosis recorded was 4.96%. The test-wise seroprevalence was 9.91% by RBPT, 9.91% by mRBPT, 9.09% by STAT, and 16.52% by I-ELISA. The prevalence of brucellosis was higher in >35-50 years age group compared to >20-35 years and >50-65 years. Sex-wise seroprevalence was higher in males than females. Taking I-ELISA as standard, the relative sensitivities of mRBPT, RBPT, and I-ELISA were in the order of mRBPT=RBPT>STAT. All the tests revealed high specificity values; however, among different serological tests, I-ELISA detected a maximum number of positive sera samples. CONCLUSIONS The prevalence of brucellosis was found to be approximately 5%. The adult (>35-50 years) age male group was most vulnerable. The routine diagnosis of brucellosis involved the conventional serological tests, viz., RBPT and STAT, but each was associated with drawbacks which could give either false-positive or false-negative interpretation. Therefore, it is always recommended to use a battery of tests in the diagnosis of brucellosis.
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Affiliation(s)
- H. K. Sharma
- Division of Veterinary Public Health and Epidemiology, Faculty of Veterinary Sciences and Animal Husbandry, Sher-e-Kashmir University of Agricultural Sciences and Technology, Jammu, Jammu and Kashmir, India
| | - S. K. Kotwal
- Division of Veterinary Public Health and Epidemiology, Faculty of Veterinary Sciences and Animal Husbandry, Sher-e-Kashmir University of Agricultural Sciences and Technology, Jammu, Jammu and Kashmir, India
| | - D. K. Singh
- Division of Veterinary Public Health, Brucella Laboratory, Indian Veterinary Research Institute, Izzatnagar, Bareilly, Uttar Pradesh, India
| | - M. A. Malik
- Division of Veterinary Public Health and Epidemiology, Faculty of Veterinary Sciences and Animal Husbandry, Sher-e-Kashmir University of Agricultural Sciences and Technology, Jammu, Jammu and Kashmir, India
| | - Arvind Kumar
- Division of Livestock Products Technology, Faculty of Veterinary Sciences and Animal Husbandry, Sher-e-Kashmir University of Agricultural Sciences and Technology, Jammu, Jammu and Kashmir, India
| | - Rajagunalan
- Division of Veterinary Public Health, Brucella Laboratory, Indian Veterinary Research Institute, Izzatnagar, Bareilly, Uttar Pradesh, India
| | - M. Singh
- Division of Veterinary Public Health and Epidemiology, Faculty of Veterinary Sciences and Animal Husbandry, Sher-e-Kashmir University of Agricultural Sciences and Technology, Jammu, Jammu and Kashmir, India
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WITHDRAWN: Acute brucellosis in Nepal: Research and prospects. JOURNAL OF ACUTE DISEASE 2016. [DOI: 10.1016/j.joad.2016.05.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Reichel MP, Lanyon SR, Hill FI. Moving past serology: Diagnostic options without serum. Vet J 2016; 215:76-81. [PMID: 27160006 PMCID: PMC7110768 DOI: 10.1016/j.tvjl.2016.04.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Revised: 04/12/2016] [Accepted: 04/19/2016] [Indexed: 11/05/2022]
Abstract
Traditional serology has moved beyond blood as a test medium. A number of different samples and tissues are now frequently used in veterinary diagnosis. Testing can be robust and accurate and opens up the field to a variety of new opportunities. Molecular testing allows direct testing for the agent on a variety of tissues and samples, and pools. Pooling of samples can allow for more efficient and cost-effective testing.
Detecting antibodies formed in serum in response to infection is the traditional function of serology. Diagnostic modalities have included complement fixation tests, agar gel immune-diffusion, radioimmunoassay, ELISA and immunofluorescence. More recent technology now allows for the direct detection of pathogens by PCR. This review details the options for diagnostic testing using specimen types other than serum, identifying the advantages and disadvantages of these options and providing evidence for more widespread use of these techniques and specimen types.
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Affiliation(s)
- Michael P Reichel
- School of Veterinary Medicine, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China; School of Animal and Veterinary Sciences, Roseworthy Campus, University of Adelaide, South Australia 5371, Australia.
| | - Sasha R Lanyon
- School of Animal and Veterinary Sciences, Roseworthy Campus, University of Adelaide, South Australia 5371, Australia
| | - Fraser I Hill
- Gribbles Veterinary, PO Box 536, Palmerston North 4440, New Zealand
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Ducrotoy MJ, Conde-Álvarez R, Blasco JM, Moriyón I. A review of the basis of the immunological diagnosis of ruminant brucellosis. Vet Immunol Immunopathol 2016; 171:81-102. [DOI: 10.1016/j.vetimm.2016.02.002] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Revised: 01/07/2016] [Accepted: 02/02/2016] [Indexed: 01/18/2023]
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Hobbs NT, Geremia C, Treanor J, Wallen R, White PJ, Hooten MB, Rhyan JC. State-space modeling to support management of brucellosis in the Yellowstone bison population. ECOL MONOGR 2015. [DOI: 10.1890/14-1413.1] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Fiasconaro M, Mannelli A, Rappazzo E, Aronica V, Ferrara MC, Vesco G, Di Marco Lo Presti V. Field evaluation of fluorescence polarization assay, and comparison with competitive ELISA for the detection of antibodies against Brucella melitensis in sheep in Sicily, Italy. Small Rumin Res 2015. [DOI: 10.1016/j.smallrumres.2015.08.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Yang JY, Zhang Y, Wang H, Xu ZL, Eremin SA, Shen YD, Wu Q, Lei HT, Sun YM. Development of fluorescence polarisation immunoassay for carbofuran in food and environmental water samples. FOOD AGR IMMUNOL 2014. [DOI: 10.1080/09540105.2014.914890] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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McGiven JA, Nicola A, Commander NJ, Duncombe L, Taylor AV, Villari S, Dainty A, Thirlwall R, Bouzelmat N, Perrett LL, Brew SD, Stack JA. An evaluation of the capability of existing and novel serodiagnostic methods for porcine brucellosis to reduce false positive serological reactions. Vet Microbiol 2012; 160:378-86. [PMID: 22763172 DOI: 10.1016/j.vetmic.2012.06.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2012] [Revised: 06/08/2012] [Accepted: 06/08/2012] [Indexed: 11/17/2022]
Abstract
Porcine brucellosis is a zoonotic disease of truly global significance because even in countries without the disease the occurrence of false positive serological reactions (FPSRs) creates significant problems. Statutory diagnostic testing is required in many disease free countries or regions and is often a prerequisite for the movement of live animals. Currently this testing is dependent almost entirely on serological assays and these may result in a significant number of FPSRs. The aim of this study was to examine existing and novel serodiagnostic assays to evaluate their diagnostic sensitivity and resilience to FPSRs. The existing assays evaluated were the RBT, smooth lipopolysaccharide (sLPS) indirect (i) ELISA, sLPS competitive (c) ELISA, and the FPA. The novel assays evaluated were the sLPS TR-FRET assay, a rough (r) LPS iELISA, a recombinant protein BP26 iELISA and a cytoplasmic protein extract (Brucellergene™) iELISA. Four populations of sera were evaluated: those from Brucella suis infected swine (n=34), randomly selected samples from non-infected swine (n=161), sera from non-infected swine within herds exhibiting FPSRs (n=132) and sera from swine experimentally infected with Yersinia enterocolitica O:9 (n=4). The results show that all the assays dependent on the sLPS O-polysaccharide (OPS) for their sensitivity (the RBT, sLPS ELISAs, FPA and the sLPS TR-FRET) had significantly reduced diagnostic specificity when applied to the FPSR population, the RBT being most affected. Of the two rapid homogeneous assays, the TR-FRET was diagnostically superior to the FPA in this study. Neither of the protein based iELISAs demonstrated sufficient diagnostic sensitivity to resolve the FPSRs. The rLPS iELISA showed no cross reaction with the FPSRs and had diagnostic sensitivity similar to that of the OPS based assays.
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Affiliation(s)
- J A McGiven
- Animal Health Veterinary Laboratories Agency (OIE Reference Laboratory for Brucellosis, WHO/FAO Collaborating Centre for Brucellosis), Woodham Lane, Addlestone, Weybridge, Surrey KT15 2NB, UK.
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Taleski V. An Overview of Introducing Various Laboratory Tests for Diagnosis of Human Brucellosis in the Republic of Macedonia. ACTA ACUST UNITED AC 2010. [DOI: 10.3889/mjms.1857-5773.2010.0135] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Godfroid J, Nielsen K, Saegerman C. Diagnosis of brucellosis in livestock and wildlife. Croat Med J 2010; 51:296-305. [PMID: 20718082 PMCID: PMC2931434 DOI: 10.3325/cmj.2010.51.296] [Citation(s) in RCA: 161] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2010] [Accepted: 06/18/2010] [Indexed: 11/05/2022] Open
Abstract
AIM To describe and discuss the merits of various direct and indirect methods applied in vitro (mainly on blood or milk) or in vivo (allergic test) for the diagnosis of brucellosis in animals. METHODS The recent literature on brucellosis diagnostic tests was reviewed. These diagnostic tests are applied with different goals, such as national screening, confirmatory diagnosis, certification, and international trade. The validation of such diagnostic tests is still an issue, particularly in wildlife. The choice of the testing strategy depends on the prevailing brucellosis epidemiological situation and the goal of testing. RESULTS Measuring the kinetics of antibody production after Brucella spp. infection is essential for analyzing serological results correctly and may help to predict abortion. Indirect ELISAs help to discriminate 1) between false positive serological reactions and true brucellosis and 2) between vaccination and infection. Biotyping of Brucella spp. provides valuable epidemiological information that allows tracing an infection back to the sources in instances where several biotypes of a given Brucella species are circulating. Polymerase chain reaction and new molecular methods are likely to be used as routine typing and fingerprinting methods in the coming years. CONCLUSION The diagnosis of brucellosis in livestock and wildlife is complex and serological results need to be carefully analyzed. The B. abortus S19 and B. melitensis Rev. 1 vaccines are the cornerstones of control programs in cattle and small ruminants, respectively. There is no vaccine available for pigs or for wildlife. In the absence of a human brucellosis vaccine, prevention of human brucellosis depends on the control of the disease in animals.
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Affiliation(s)
- Jacques Godfroid
- Section of Arctic Veterinary Medicine, Department of Food Safety and Infection Biology, Norwegian School of Veterinary Science, Stakkevollveien 2, 9010 Tromso, Norway.
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Treanor JJ, Johnson JS, Wallen RL, Cilles S, Crowley PH, Cox JJ, Maehr DS, White PJ, Plumb GE. Vaccination strategies for managing brucellosis in Yellowstone bison. Vaccine 2010; 28 Suppl 5:F64-72. [PMID: 20362620 DOI: 10.1016/j.vaccine.2010.03.055] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2010] [Accepted: 03/19/2010] [Indexed: 11/26/2022]
Abstract
Concerns over migratory bison (Bison bison) at Yellowstone National Park transmitting brucellosis (Brucella abortus) to cattle herds on adjacent lands led to proposals for bison vaccination. We developed an individual-based model to evaluate how brucellosis infection might respond under alternate vaccination strategies, including: (1) vaccination of female calves and yearlings captured at the park boundary when bison move outside the primary conservation area; (2) combining boundary vaccination with the remote delivery of vaccine to female calves and yearlings distributed throughout the park; and (3) vaccinating all female bison (including adults) during boundary capture and throughout the park using remote delivery of vaccine. Simulations suggested Alternative 3 would be most effective, with brucellosis seroprevalence decreasing by 66% (from 0.47 to 0.16) over a 30-year period resulting from 29% of the population receiving protection through vaccination. Under this alternative, bison would receive multiple vaccinations that extend the duration of vaccine protection and defend against recurring infection in latently infected animals. The initial decrease in population seroprevalence will likely be slow due to high initial seroprevalence (40-60%), long-lived antibodies, and the culling of some vaccinated bison that were subsequently exposed to field strain Brucella and reacted positively on serologic tests. Vaccination is unlikely to eradicate B. abortus from Yellowstone bison, but could be an effective tool for reducing the level of infection. Our approach and findings have applicability world-wide for managers dealing with intractable wildlife diseases that cross wildlife-livestock and wildlife-human interfaces and affect public health or economic well-being.
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Affiliation(s)
- John J Treanor
- National Park Service, Yellowstone National Park, WY 82190, USA.
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Time-resolved fluorescent resonance energy transfer assay for simple and rapid detection of anti-Brucella antibodies in ruminant serum samples. J Clin Microbiol 2009; 47:3098-107. [PMID: 19656980 DOI: 10.1128/jcm.00919-09] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Brucellosis is a globally significant zoonosis, the control of which is difficult and resource intensive. Serological tests form a vital part of a multifactorial approach to control and are often performed in large numbers. The aim of the present study was to develop a new assay to improve the efficiency, ease, and effectiveness of serological testing. An existing competitive enzyme-linked immunosorbent assay (cELISA) was adapted to a completely homogeneous time-resolved fluorescent resonance energy transfer (TR-FRET) assay. This was achieved by labeling an anti-Brucella monoclonal antibody with a long-lifetime donor fluorophore and Brucella smooth lipopolysaccharide with a compatible acceptor and optimizing the reading conditions. The assay was performed in a 96-well plate with a single 30-min incubation period and no separation (wash) steps and was concluded by a single plate-reading step. The performance of the assay was evaluated with a panel of serum samples from infected (n = 73) and uninfected (n = 480) sources and compared to the performance of the parent cELISA, an indirect ELISA (iELISA), and fluorescence polarization assay (FPA). The performance of the TR-FRET assay matched the performance of the iELISA, which had 100% diagnostic sensitivity and specificity, and surpassed the performance of the cELISA and the FPA. The results also demonstrated that the TR-FRET technique is effective with poor-quality serum samples from the field. To the knowledge of the authors, this is the first homogeneous TR-FRET assay to detect antibodies raised against an infectious disease. The technique appears to be sufficiently adaptable to meet the needs of many other similar testing requirements to identify infectious diseases.
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Kamaraj G, Chinchkar SR, Rajendra L, Srinivasan VA. A combined vaccine against Brucella abortus and infectious bovine rhinotracheitis. Indian J Microbiol 2009; 49:161-8. [PMID: 23100765 PMCID: PMC3450140 DOI: 10.1007/s12088-009-0028-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2008] [Accepted: 12/29/2008] [Indexed: 10/20/2022] Open
Abstract
The present study was undertaken to study the immune response in calves vaccinated with Brucella abortus strain 19, infectious bovine rhinotracheitis (IBR) vaccines in monovalent form and combined vaccine containing both antigen. The seroconversion of monovalent and combined vaccines was tested in seronegative cattle calves. IBR vaccine alone and combination with live Brucella abortus S19 vaccine elicited an anamnestic response on day 60 post booster but started declining from day 90 onwards against IBR. B. abortus S19 alone and in combination with IBR vaccine gave more than 2 log protection in mice two weeks post challenge. Fluorescence polarization assay analysis with sera samples of calves vaccinated with B. abortus S19 monovalent vaccine alone and in combination with IBR vaccine revealed the presence of B. abortus antibodies. The components of the combined vaccine did not show any evidence of interference in the development of immunity. This combined vaccine may provide economical and affordable biological for the control of brucellosis and IBR.
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Competitive electrochemiluminescence wash and no-wash immunoassays for detection of serum antibodies to smooth Brucella strains. CLINICAL AND VACCINE IMMUNOLOGY : CVI 2009; 16:765-71. [PMID: 19261777 DOI: 10.1128/cvi.00006-09] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Brucellosis is a bacterial zoonotic disease of major global importance. Natural hosts for Brucella species include animals of economic significance, such as cattle and small ruminants. Controlling brucellosis in natural hosts by high-throughput serological testing followed by the slaughter of seropositive animals helps to prevent disease transmission. This study aimed to convert an existing competitive enzyme-linked immunosorbent assay (cELISA), used for the serodiagnosis of brucellosis in ruminants, to two electrochemiluminescence (ECL) immunoassays on the Meso Scale Discovery (MSD) platform. The first assay employed a conventional plate washing step as part of the protocol. The second was a no-wash assay, made possible by the proximity-based nature of ECL signal generation by the MSD platform. Both ECL wash and no-wash assays closely matched the parent cELISA for diagnostic sensitivity and specificity. The results also demonstrated that both ECL assays met World Organization for Animal Health (OIE) standards, as defined by results for the OIE standard serum (OIEELISA(SP)SS). This report is the first to describe an ECL assay incorporating lipopolysaccharide, an ECL assay for serodiagnosis of a bacterial infectious disease, a separation-free (no-wash) ECL assay for the detection of serum antibodies, and the use of the MSD platform for serodiagnosis. The simple conversion of the cELISA to the MSD platform suggests that many other serodiagnostic tests could readily be converted. Furthermore, the alignment of these results with the multiplex capability of the MSD platform offers the potential of no-wash multiplex assays to screen for several diseases.
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Effectiveness of Rose Bengal test and fluorescence polarization assay in the diagnosis of Brucella spp. infections in free range cattle reared in endemic areas in Zambia. Trop Anim Health Prod 2008; 41:723-9. [DOI: 10.1007/s11250-008-9244-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2008] [Accepted: 10/14/2008] [Indexed: 10/21/2022]
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Minas A, Stournara A, Christodoulopoulos G, Katsoulos PD. Validation of a competitive ELISA for diagnosis of Brucella melitensis infection in sheep and goats. Vet J 2008; 177:411-7. [PMID: 17574884 DOI: 10.1016/j.tvjl.2007.05.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2006] [Revised: 04/25/2007] [Accepted: 05/01/2007] [Indexed: 11/24/2022]
Abstract
A competitive enzyme-linked immunosorbent assay (cELISA) was validated for the serodiagnosis of Brucella melitensis infection in small ruminants using 2108 positive and 2154 negative reference sera from sheep and goats. The optimum cut-off values, offering the highest diagnostic sensitivity (DSn) and diagnostic specificity (DSp), determined by receiver operating characteristic analysis, were at 23.6%, 21.8% and 25.0% inhibition of the conjugate control for sheep, goats and both species, respectively. The DSns of the cELISA for sheep, goats and both species at these cut-off values were 89.2% (95% confidence interval 87.1-91.1%), 74.0% (95% CI 71.4-76.5%) and 77.9% (95% CI 76.1-79.7%), whereas DSps were 96.4% (95% CI 95.2-97.4%), 92.9% (95% CI 91.1-94.3%) and 97.2% (95% CI 96.4-97.8%), respectively. Compared to cELISA, indirect ELISA and fluorescence polarisation assay have higher DSns and DSps. However, the results obtained with the cELISA were in good agreement with those of the complement fixation test (CFT) under field conditions using 5735 sheep and goat sera. The cELISA can be used as an alternative to the CFT for diagnosing B. melitensis infection in small ruminants.
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Affiliation(s)
- Anastasios Minas
- Technological Educational Institution of Larissa, Department of Medical Laboratories, Laboratory of Microbiology, Larissa 411 10, Greece.
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McGiven JA, Sawyer J, Perrett LL, Brew SD, Commander NJ, Fisher A, McLarnon S, Harper K, Stack JA. A new homogeneous assay for high throughput serological diagnosis of brucellosis in ruminants. J Immunol Methods 2008; 337:7-15. [DOI: 10.1016/j.jim.2008.05.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2008] [Revised: 04/28/2008] [Accepted: 05/05/2008] [Indexed: 10/22/2022]
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Montagnaro S, Longo M, Mallardo K, Pisanelli G, De Martino L, Fusco G, Baldi L, Pagnini U, Iovane G. Evaluation of a fluorescence polarization assay for the detection of serum antibodies to Brucella abortus in water buffalo (Bubalus bubalis). Vet Immunol Immunopathol 2008; 125:135-42. [PMID: 18599128 DOI: 10.1016/j.vetimm.2008.05.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2007] [Revised: 04/29/2008] [Accepted: 05/19/2008] [Indexed: 11/26/2022]
Abstract
The fluorescence polarization assay (FPA) was evaluated for the serological diagnosis of brucellosis in water buffalo (Bubalus bubalis) in southern Italy. This assay uses O-polysaccharide prepared from Brucella abortus lipopolysaccharide conjugated with fluorescein isothiocyanate as a tracer. It has many methodological advantages over older, more established tests and can be performed in a fraction of the time. Sera from 890 buffalos from the Campania Region - 526 positive sera and 364 negative sera according to the complement fixation test (CFT) - were evaluated in this study. All samples were tested with the Rose Bengal test (RBT), CFT, and FPA in parallel and in blind fashion. Sensitivities (Sn) were 84.5% and 92.6%, and specificities (Sp) were 93.1% and 91.2% for RBT and FPA, respectively, relative to CFT. Finally, receiver operating characteristic (ROC) analysis suggested a cut-off value of 117 millipolarization (mP) units. On the whole, these results suggested that FPA might replace RBT in the diagnosis of buffalo brucellosis for its better performance relative to CFT, its adjustable cut-off useful in different epidemiological situations, its reliability, ease of performance, and for its potential application in field and high-throughput laboratories.
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Affiliation(s)
- S Montagnaro
- Department of Pathology and Animal Health, University of Naples Federico II, Via Delpino no. 1, 80137 Naples, Italy.
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Use of the Brucella melitensis native hapten to diagnose brucellosis in goats by a rapid, simple, and specific fluorescence polarization assay. CLINICAL AND VACCINE IMMUNOLOGY : CVI 2008; 15:911-5. [PMID: 18385457 DOI: 10.1128/cvi.00046-08] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The performance of the fluorescence polarization assay (FPA) using the recently described Brucella melitensis native hapten and the Brucella abortus O-polysaccharide tracer was evaluated and compared with those of The World Organization for Animal Health tests related to indirect and competitive enzyme-linked immunosorbent assays as classification variables for goat sera obtained from a high-prevalence area where vaccination was performed; test series were also evaluated to increase the final specificity of the tests. Our results showed that the respective relative sensitivity and specificity were 99.7% and 32.5% for the rose Bengal test with a 3% cell concentration (RBT3), 92.8% and 68.8% for the rose Bengal test with 8% cell concentration (RBT8), 98.4% and 84.9% for the Canadian complement fixation test (CFT), 83.7% and 65.5% for the Mexican CFT, 98.4% and 81.0% for the buffered plate agglutination test (BPAT), and 78.1% and 89.3% for the fluorescence polarization assay (FPA). The use of the FPA as the secondary test significantly increased the final specificities of test combinations; the screening tests BPAT, RBT3, and RBT8 plus FPA resulted in 90%, 91.2%, and 91.3% final specificities, respectively, whereas for the combinations RBT3 plus Mexican CFT, RBT8 plus Mexican CFT, and BPAT plus Canadian CFT, the specificities were 65.5%, 63.2%, and 91.7%, respectively. The results suggested that the FPA may be routinely applied as an adaptable screening test for diagnosis of goat brucellosis, since its cutoff can be adjusted to improve its sensitivity or specificity, it is a rapid and simple test, it can be the test of choice when specificity is relevant or when an alternative confirmatory test is not available, and it is not affected by vaccination, thus reducing the number of goats wrongly slaughtered due to misdiagnosis.
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Ramírez-Pfeiffer C, Díaz-Aparicio E, Rodríguez-Padilla C, Morales-Loredo A, Alvarez-Ojeda G, Gomez-Flores R. Improved performance of Brucella melitensis native hapten over Brucella abortus OPS tracer on goat antibody detection by the fluorescence polarization assay. Vet Immunol Immunopathol 2008; 123:223-9. [PMID: 18359093 DOI: 10.1016/j.vetimm.2008.02.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2007] [Revised: 01/22/2008] [Accepted: 02/08/2008] [Indexed: 10/22/2022]
Abstract
The current method for goat brucellosis diagnosis is based on the World Organization for Animal Health (OIE) using the screening card test (CT), with antigen at 8% (CT8) or 3% (CT3) of cell concentrations, and the confirmatory complement fixation test (CFT). However, these tests do not differentiate antibodies induced by vaccination from those derived from field infections by Brucella species or other bacterial agents; in places like Mexico, where the prevalence of brucellosis and the vaccination rates are high, there is a considerable percentage of false positive reactions that causes significant unnecessary slaughter of animals. Furthermore, results of the fluorescence polarization assay (FPA) using the Brucella abortus O-polysaccharide (OPS) tracer in goats are poorer than those with cattle. The present study was undertaken to investigate a tracer prepared from the native hapten (NH) of the Rev. 1 strain of Brucella melitensis to improve FPA performance on goat brucellosis diagnosis. Evaluation of 48 positive samples and 96 negative samples showed that the NH tracer was more accurate (p<0.01) than the OPS tracer (97.2% vs. 93.8% accuracy, respectively). On the diagnostic performance evaluation, the NH tracer performed better (87.5% accuracy, 79.5% sensitivity, 84.3% specificity, and 163.8 performance index) than the OPS tracer (83.5%, 75.9%, 81.0%, and 156.9, respectively) using 1009 positive and 2039 negative Mexican field goat sera samples selected by test series approved by the OIE (card test 3% and CFT). We demonstrated a new application for the NH lipopolysaccharide on detecting antibodies against Brucella using the FPA, which may yield faster results (minutes vs. 24-72h) than the immunodiagnosis assays frequently used in bovine brucellosis. In addition, NH tracer produces similar or better performance results than the conventional OPS tracer, using the FPA in goat sera samples.
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Affiliation(s)
- C Ramírez-Pfeiffer
- Instituto Nacional de Investigaciones Forestales y Agropecuarias, Campo Experimental Río Bravo, Río Bravo, Tamaulipas, Mexico
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Muma JB, Toft N, Oloya J, Lund A, Nielsen K, Samui K, Skjerve E. Evaluation of three serological tests for brucellosis in naturally infected cattle using latent class analysis. Vet Microbiol 2007; 125:187-92. [PMID: 17590540 DOI: 10.1016/j.vetmic.2007.05.012] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2006] [Revised: 05/02/2007] [Accepted: 05/10/2007] [Indexed: 10/23/2022]
Abstract
Serological methods are traditionally used in diagnosis of brucellosis. However, the comparative performance of these tests and their accuracy under the local environment in Zambia has not been assessed. Thus, the objective of our study was to evaluate the diagnostic performance of three serological tests for brucellosis; Rose Bengal Test (RBT), competitive ELISA (c-ELISA) and Fluorescence Polarisation Assay (FPA) in naturally infected cattle in Zambia without an appropriate reference test to classify animals into truly infected and non-infected. Serological test results from a study to determine sero-prevalence were used to compare the performance of RBT, c-ELISA and FPA in diagnosing brucellosis in traditional cattle. Since none of the tests can be seen as a perfect reference test or gold standard, their performance in a population of naturally infected cattle was evaluated using latent class analysis which allows the sensitivity (Se) and specificity (Sp) to be estimated in the absence of a gold standard. The highest Se was achieved by the c-ELISA (97%; Credible Posterior Interval (CPI)=93-100%) and the highest Sp by the FPA (93%; CPI=85-99%), conversely these tests also had the lowest Sp and Se, respectively, with the RBT performing well in both the Se (93%; CPI=84-98%) and Sp (81%; CPI=61-97).
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Affiliation(s)
- J B Muma
- Department of Disease Control, University of Zambia, School of Veterinary Medicine, Lusaka, Zambia
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Mainar-Jaime RC, Barberán M. Evaluation of the diagnostic accuracy of the modified agglutination test (MAT) and an indirect ELISA for the detection of serum antibodies against Toxoplasma gondii in sheep through Bayesian approaches. Vet Parasitol 2007; 148:122-9. [PMID: 17624672 DOI: 10.1016/j.vetpar.2007.05.018] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2007] [Revised: 05/22/2007] [Accepted: 05/24/2007] [Indexed: 11/25/2022]
Abstract
The diagnostic accuracies of the modified agglutination test (MAT) and indirect ELISA test for the detection of serum antibodies against Toxoplasma gondii in sheep were evaluated through Bayesian approaches on two populations of sheep created from three different groups of animals (T. gondii-aborted ewes, colostrums-deprived newborn lambs, and ewe-lambs and adult ewes with unknown T. gondii infection status). Tests showed a high degree of agreement (kappa statistic = 0.93; 95% confidence interval = 0.87, 0.98) and a significant specificity (Sp) correlation (gamma(Sp) = 0.26; 95% credibility interval = 0.017, 0.61). When prior information was used for all unknown parameters the posterior medians for the sensitivity (Se) and Sp of the MAT and ELISA were, respectively, 92.6% (95% credibility interval = 85.2, 96.9), 95.5% (89.9, 98.7), 90.5% (83.4, 95.6), and 97.8% (94.2, 99.5). These estimates remained similar when uninformative priors were included. The Se estimates of the MAT and ELISA were higher than those obtained on pigs in other study using the same approach (Se = 80.6% and Sp = 89.5% for the MAT, and Se = 71.5% and Sp = 85.5% for the ELISA [Georgiadis, M.P., Wesley, O.J., Gardner, I.A., Singh, R., 2003. Correlation-adjusted estimation of sensitivity and specificity of two diagnostic tests. Appl. Stat. 52, 63-78]. This finding supported the believe that test performances may vary when applied on different animal species. Thus, if these tests are planned to be used on animal species other than sheep or pigs, their diagnostic accuracy should be re-assessed to prevent biased inferences from their results.
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Affiliation(s)
- R C Mainar-Jaime
- Unidad Sanidad Animal, Centro de Investigación y Tecnología Agroalimentaria, Gobierno de Aragón. Apdo. Correos 727, 50080 Zaragoza, Spain.
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Minas A, Stournara A, Minas M, Stack J, Petridou E, Christodoulopoulos G, Krikelis V. Validation of a fluorescence polarization assay (FPA) performed in microplates and comparison with other tests used for diagnosing B. melitensis infection in sheep and goats. J Immunol Methods 2007; 320:94-103. [PMID: 17258229 DOI: 10.1016/j.jim.2006.12.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2006] [Revised: 11/27/2006] [Accepted: 12/13/2006] [Indexed: 11/17/2022]
Abstract
Fluorescence polarization assay (FPA) is a relatively new test for the serological diagnosis of Brucella spp. infection in animals. FPA, carried out in 96-well microplate format, was validated here for diagnosing B. melitensis infection in sheep and goats. This study included sera from 1933 sheep and goats, from animals reared in naturally infected flocks (verified by culture) and showing a positive reaction to two different tests conducted in parallel. In addition, 2154 sera originating from healthy sheep and goats, reared in areas where B. melitensis had never been isolated, were assayed. The optimum cut-off value offering the highest diagnostic sensitivity (DSn) and diagnostic specificity (DSp) was determined at 15 mP over the mean value of the buffer control used in each microplate as determined by receiver operating characteristic analysis. The DSn and DSp of the FPA for small ruminants carried out in microplates at this cut-off value were calculated to be 95.9% and 97.9% with 95% confidence intervals (95% CI) of 94.9-97.7% and 97.2-98.4%, respectively. The accuracy of the FPA, as expressed by determination of the area under the curve, was 0.991. Indirect ELISA and FPA tests offered the highest DSn when compared with the Rose Bengal test, the complement fixation test, the modified Rose Bengal test and competitive ELISA. The parallel or serial combination of FPA with indirect ELISA offers the highest DSn and DSp. As temperature can affect the results of the FPA, all reagents must be at the same temperature and the standard for comparison must always be read under the same conditions as the sera under test. FPA performed in microplates is a promising assay; the DSn and accuracy are better than those of the tests currently approved for diagnosing B. melitensis in small ruminants. Because of its simplicity, speed, and accuracy, this test can improve capacity for laboratory testing and the efficacy of an eradication program based on a test-and-slaughter policy.
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Affiliation(s)
- A Minas
- Technological Educational Institution of Larissa, Faculty of Health Professions, Laboratory of Microbiology, Larissa, 411 10, Greece.
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Ramírez-Pfeiffer C, Nielsen K, Smith P, Marín-Ricalde F, Rodríguez-Padilla C, Gomez-Flores R. Application of the fluorescence polarization assay for detection of caprine antibodies to Brucella melitensis in areas of high prevalence and widespread vaccination. CLINICAL AND VACCINE IMMUNOLOGY : CVI 2007; 14:299-303. [PMID: 17267588 PMCID: PMC1828857 DOI: 10.1128/cvi.00350-06] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The screening Rose Bengal test (RBT), the buffered plate agglutination test (BPAT), and the confirmatory complement fixation test (CFT) are currently approved by the World Organization for Animal Health (OIE) for diagnosis of goat brucellosis. However, RBT (at 3% or 8% cell concentration) is known to be affected by vaccinal antibodies. In the present study, Mexican and Canadian OIE tests were compared with the fluorescence polarization assay (FPA), alone or in combination, using indirect and competitive enzyme-linked immunosorbent assays as classification variables for goat sera obtained from an area of high prevalence and widespread vaccination. The relative sensitivities and specificities were, respectively, 99.7% and 32.5% for RBT3, 92.8% and 68.8% for RBT8, 98.4% and 84.8% for Canadian CFT, 83.7% and 65.5% for Mexican CFT, and 78.1% and 89.3% for FPA. The use of FPA as the confirmatory test in combination with other tests significantly increased the final specificities of the screening tests alone; BPAT, RBT3, and RBT8 plus FPA resulted in final specificities of 90%, 91.2%, and 91.3%, respectively, whereas for the combinations RBT3 plus Mexican CFT, RBT8 plus Mexican CFT, and BPAT plus Canadian CFT, specificities were 65.5%, 63.2%, and 91.7%, respectively. We suggest that FPA may be routinely applied as an adaptable screening test for diagnosis of goat brucellosis and as a confirmatory test for screening test series. Some advantages of FPA are that its cutoff can be adjusted to improve its sensitivity or specificity, it is a low-cost and easy-to-perform test of choice when specificity is relevant or when an alternative confirmatory test is not available, and it is not affected by vaccination, thus reducing the number of misdiagnosed and killed goats.
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Affiliation(s)
- C Ramírez-Pfeiffer
- Río Guadalquivir 401-B Ote., Colonia del Valle, San Pedro Garza García, Nuevo León, México, C.P. 66220
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Stournara A, Minas A, Bourtzi-Chatzopoulou E, Stack J, Koptopoulos G, Petridou E, Sarris K. Assessment of serological response of young and adult sheep to conjunctival vaccination with Rev-1 vaccine by fluorescence polarization assay (FPA) and other serological tests for B. melitensis. Vet Microbiol 2007; 119:53-64. [PMID: 16973307 DOI: 10.1016/j.vetmic.2006.08.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2006] [Revised: 07/24/2006] [Accepted: 08/01/2006] [Indexed: 10/24/2022]
Abstract
The serological response of young and adult sheep vaccinated conjunctivally with Rev-1 vaccine was assessed by fluorescence polarization assay (FPA), Rose Bengal test (RBT), complement fixation test (CFT), modified Rose Bengal test (m-RBT), indirect ELISA (i-ELISA) and competitive ELISA (c-ELISA), at different post vaccination intervals. One hundred and thirty six adult sheep and 64 lambs were used in the study. The vaccinated animals were bled prior to vaccination (0 day) and thereafter at 21st, 42nd, 35th, 63rd, 91st, 125th, 159th, and 223rd and 330th day post vaccination. The majority of animals (young and adult) showed positive reaction by FPA, RBT, CFT, m-RBT and c-ELISA 21 days post vaccination, whereas by i-ELISA at 42 days. All tests perform equal when animals vaccinated as young are tested 125 days (4 months) post vaccination. In case of animals vaccinated at adulthood, FPA, RBT, CFT and c-ELISA perform equal if the animals are tested 223 days (approximately 8 months) post vaccination. I-ELISA and m-RBT show low specificity if ewes vaccinated at adulthood are tested 330 days (11 months) post vaccination. If control of brucellosis in sheep is based on conjunctivally vaccination of lambs with Rev-1, the vaccinated animals can be tested by any test used for diagnosis of B.melitensis infection accurately at least 4 months post vaccination. If brucellosis control is based on mass vaccination the use of m-RBT and i-ELISA is not recommended for testing adult animals at least for 330 days (11 months) post vaccination due to tests low specificity. Further research is needed so the appropriate cut-offs to be established for FPA, c-ELISA or i-ELISA to become valuable tools for the eradication of Brucella spp. infection in small ruminants in areas where vaccination is practiced.
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Affiliation(s)
- A Stournara
- Veterinary Laboratory of Larissa, National Reference Laboratory of Brucellosis, 411 10 Larissa, Greece
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43
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Jolley ME, Nasir MS, Surujballi OP, Romanowska A, Renteria TB, De la Mora A, Lim A, Bolin SR, Michel AL, Kostovic M, Corrigan EC. Fluorescence polarization assay for the detection of antibodies to Mycobacterium bovis in bovine sera. Vet Microbiol 2006; 120:113-21. [PMID: 17118585 DOI: 10.1016/j.vetmic.2006.10.018] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2006] [Revised: 10/16/2006] [Accepted: 10/18/2006] [Indexed: 11/16/2022]
Abstract
The performance of a fluorescence polarization assay (FPA) that detects antibodies to Mycobacterium bovis in bovine sera is described. The FPA reported here is a direct binding primary screening assay using a small polypeptide derived from the M. bovis MPB70 protein. A secondary inhibition assay confirms suspect or presumed positive samples. Specificity studies involved five different veterinary laboratories testing 4461 presumed negative bovine samples. FPA specificity was 99.9%. The FPA was used to identify herd status as either M. bovis infected or non-infected. Herd surveillance studies (nine herds) were performed in Mexico and South Africa. The FPA had a specificity of 100% (two negative herds), and correctly identified six of seven infected herds. Finally, sera from 105 slaughter animals that had gross lesions in lymph nodes similar to those seen with bovine tuberculosis were tested by the FPA. Thin sections from the associated formalin-fixed paraffin-embedded samples of lymph nodes were stained using hematoxylin and eosin (H&E) for morphologic examination and using the Ziehl-Neelsen (ZN) method for detection of acid-fast bacilli. Of the 105 animals, 78 were classified as TB suspect based on lesion morphology, 21 were positive by ZN, 9 were positive by FPA and 13 were positive by PCR for the tuberculosis group of Mycobacterium. Among the 21 ZN positives, 11 (52.4%) were PCR positive. Among the 9 FPA positives, 8 (88.9%) were PCR positive. For the 13 PCR positives, 8 (61.5%) were FPA positive and 11 (84.6%) were ZN positives. These results show that use of the FPA for detection of M. bovis infection of cattle has value for bovine disease surveillance programs.
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Affiliation(s)
- Michael E Jolley
- Diachemix LLC, 683 E. Center Street Unit H, Grayslake, IL 60030, USA.
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Gall D, Nielsen K, Yu W, Smith P. Rapid, field-adapted indirect enzyme-linked immunosorbent assay for detection of antibodies in bovine whole blood and serum to Brucella abortus. CLINICAL AND VACCINE IMMUNOLOGY : CVI 2006; 13:501-6. [PMID: 16603619 PMCID: PMC1459638 DOI: 10.1128/cvi.13.4.501-506.2006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
A simple, rapid, field-adapted indirect enzyme-linked immunoassay (FldELISA) for the detection of antibodies to Brucella abortus in whole blood and serum has been developed. This assay detects antibodies to B. abortus in approximately 15 min or less. Over a 3-month period, this assay has consistently identified immunized and nonimmunized animals, while the percent coefficient of variation for each immunized animal has been less than 20%. As with any indirect enzyme-linked immunoassay, quality control can be established and maintained. Using defined positive and negative sera, the sensitivity and specificity of the FldELISA was 100% and 94.2%, respectively. As a model, this test can be readily extended to other disease applications that use lipopolysaccharide or other stable antigens for the detection of antibodies, such as those to Salmonella spp., Escherichia coli, or Yersinia spp.
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Affiliation(s)
- D Gall
- Canadian Food Inspection Agency, Ottawa Laboratory Fallowfield, 3851 Fallowfield Rd., Ottawa, Ontario, Canada K2H 8P9.
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Koskinen JO, Vaarno J, Vainionpää R, Meltola NJ, Soini AE. A novel separation-free assay technique for serum antibodies using antibody bridging assay principle and two-photon excitation fluorometry. J Immunol Methods 2005; 309:11-24. [PMID: 16387323 DOI: 10.1016/j.jim.2005.10.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2005] [Revised: 10/03/2005] [Accepted: 10/27/2005] [Indexed: 11/30/2022]
Abstract
A new technique for separation-free detection of antigen-specific antibodies is presented. The new technique employs antibody bridging assay principle and the recently developed ArcDia TPX fluorescence detection technology. According to the assay scheme, antibody molecules from the sample bind with one arm to an antigen on polymer microspheres and with the other arm to a fluorescently labeled secondary antigen reagent. Consequently, fluorescent immunocomplexes are formed on the surface of microspheres in proportion to the concentration of the analyte in the sample. The fluorescence signal from individual microspheres is measured by means of two-photon excited fluorescence detection. In order to demonstrate the applicability of the new assay technique, an assay for anti-adenovirus antibodies was constructed. The function of the assay method was tested both with monoclonal anti-adenovirus antibody preparation (standard analyte), and with positive serum samples. Standard class-specific ELISA was used as a reference method. The new assay method provides comparable sensitivity and precision, and wider dynamic range for IgG antibodies than the ELISA method. The standard curve showed linear response (R(2)=0.999) with a dynamic range of three orders of magnitude, detection limit (mean+3S.D.) of 8 pM, and intra-assay signal precision of 5%. Applicability of the new method for clinical serodiagnostics is discussed.
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Affiliation(s)
- Janne O Koskinen
- Laboratory of Biophysics, Institute of Biomedicine, University of Turku, Finland
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Ramirez-Pfeiffer C, Nielsen K, Marin-Ricalde F, Rodríguez-Padilla C, Gomez-Flores R. Comparison of fluorescence polarization assay with card and complement fixation tests for the diagnosis of goat brucellosis in a high-prevalence area. Vet Immunol Immunopathol 2005; 110:121-7. [PMID: 16242780 DOI: 10.1016/j.vetimm.2005.09.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2005] [Revised: 08/15/2005] [Accepted: 09/21/2005] [Indexed: 11/29/2022]
Abstract
An evaluation of fluorescence polarization assay (FPA) to detect antibodies against Brucella melitensis according to the Mexican Official Norm (NOM) was performed. In this study, a total of 2582 goat serum samples from a high-prevalence area in northeast Mexico where vaccination is applied, were used. Of these, 1094 were classified as NOM negatives (card test (CT) negatives or CT positives/complement fixation test (CFT) negatives) and 1488 as NOM positives (CT and CFT positives). The receiver operator characteristics (ROC) curve analysis was used to obtain the FPA sensitivity (83.5%), specificity (82.2%) and accuracy (88.2%) compared with NOM criteria, using a cut-off value of 89mP for positive samples. In addition, FPA produced 84.1% of negative results versus 65.7% of CT using 1094 CFT negative samples, which indicated that FPA performance was better than CT to detect negative samples or differentiate samples from vaccinated animals. Finally, FPA showed 95.8% sensitivity when using 702 negative non-vaccinated samples. Taken together, these results suggested that FPA might replace CT as a screening test for its better performance compared with CFT, its adjustable cut-off useful in different epidemiological situations, and for its reliability, ease of performance, comparable cost with CT regimen, and potential application in field and high-throughput laboratories. The use of FPA as screening test will help to reduce the percentage of goats wrongly slaughtered because of brucellosis misdiagnosis. More studies on FPA are required for its approval as diagnostic tool for goat brucellosis.
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Affiliation(s)
- C Ramirez-Pfeiffer
- Instituto Nacional de Investigaciones Forestales y Agropecuarias, Campo Experimental Aldama, Aldama, Tam., México
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Affiliation(s)
- Raz Jelinek
- Department of Chemistry and Staedler Minerva Center for Mesoscopic Macromolecular Engineering, Ben Gurion University of the Negev, Beersheva 84105, Israel.
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Burriel A, Christodoulopoulos G, Bisias G, Fthenakis G. Comparison of fluorescence polarization assay, indirect ELISA and competitive ELISA methods for diagnosis of Brucella melitensis-infection in small ruminants. Small Rumin Res 2004. [DOI: 10.1016/j.smallrumres.2003.12.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Ma LY, Wang HY, Xie H, Xu LX. A long lifetime chemical sensor: study on fluorescence property of fluorescein isothiocyanate and preparation of pH chemical sensor. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2004; 60:1865-1872. [PMID: 15248962 DOI: 10.1016/j.saa.2003.10.004] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2003] [Revised: 10/08/2003] [Accepted: 10/13/2003] [Indexed: 05/24/2023]
Abstract
The fluorescence property of fluorescein isothiocyanate (FITC) in acid-alkaline medium was studied by spectrofluorimetry. The characteristic of FITC response to hydrogen ion has been examined in acid-alkaline solution. A novel pH chemical sensor was prepared based on the relationship between the relative fluorescence intensity of FITC and pH. The measurement of relative fluorescence intensity was carried out at 362 nm with excitation at 250 nm. The excellent linear relationship was obtained between relative fluorescence intensity and pH in the range of pH 1-5. The linear regression equation of the calibration graph is F = 66.871 + 6.605 pH (F is relative fluorescence intensity), with a correlation coefficient of linear regression of 0.9995. Effects of temperature, concentration of FITC on the response to hydrogen ion had been examined. It was important that this chemical sensor was long lifetime, and the property of response to hydrogen ion was stable for at least 70 days. This pH sensor can be used for measuring pH value in water solution. The accuracy is 0.01 pH unit. The results obtained by the pH sensor agreed with those by the pH meter. Obviously, this pH sensor is potential for determining pH change real time in biological system.
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Affiliation(s)
- Li Ying Ma
- Department of Chemistry, Binzhou Medical College, Binzhou 256603, PR China
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50
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L GT, Lu B, Bai YJ, Zhang J, Yan XJ. Paired mutation in core promoter region of HBV in hepatocellular carcinoma by TDI-FP assay. Shijie Huaren Xiaohua Zazhi 2003; 11:916-919. [DOI: 10.11569/wcjd.v11.i7.916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM To detect the A1762 T and G1764 A paired mutations in the core promoter region of the HBV DNA in the hepatocellular carcinoma, to investigate the relationship between them, and to establish a new method for genotyping of mutation patterns.
METHODS The target DNA fragment of the HBV core promoter region which contains the paired mutations was amplified by polymerase chain reaction and the FP value of the R110- or TAMRA-labeled ddNTP was detected by TDI-FP assay to determine the nt1762 and nt1764 genotype.
RESULTS Of 20 cases of hepatocellular carcinoma, 18 (90%) was positive for HBV infection. Through TDI-FP assay, there were 13 /20 for T1762 and A1764 paired mutations, 1/20 heterozygous for T1762-A1764/ A1762-G1764 4/20 negative for the TDI-FP assay. By sequencing, the positive and heterozygous mutations completely accorded with the TDI-FP assay. In the negative results, 2/4 had 8-nucleotide deletion mutation, thus the mutation detection primer could not complement with the template and gave rise to the "false" negative results. The rate of T1762-A1764 positive mutation rate of HBV DNA in heaptocellular carcinoma was 85%, heterozygous 5%, and wild-type 10%.
CONCLUSION The HBV infection is very high in the heaptocellular carcinoma. The great frequency of the paired mutations in the core promoter indicates that the paired mutations may be significantly related to the pathogenesis of hepatocellular carcinoma. The established TDI-FP is suitable for high throughput and automated genotyping assays due to its rapid and simple manipulation.
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Affiliation(s)
- Guan-Ting L
- The Institute of Genetic Diagnosis, PLA, Fourth Military Medical University, Xi'an 710032, Shaan'xi Province, China
| | - Bing Lu
- Sanitation and Anti-epidemic Station, Jiu Jiang 332000, Jiang'xi Province, China
| | - Yu-Jie Bai
- The Institute of Genetic Diagnosis, PLA, Fourth Military Medical University, Xi'an 710032, Shaan'xi Province, China
| | - Jian Zhang
- The Institute of Genetic Diagnosis, PLA, Fourth Military Medical University, Xi'an 710032, Shaan'xi Province, China
| | - Xiao-Jun Yan
- The Institute of Genetic Diagnosis, PLA, Fourth Military Medical University, Xi'an 710032, Shaan'xi Province, China
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