A comparison between indirect ELISA and tuberculin skin test in the diagnosis of bovine tuberculosis in Kenya

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Daniel Muasya ◽  
George Karuoya Gitau ◽  
Thaiyah Gitau Andrew ◽  
Daniel Waweru Gakuya ◽  
John Vanleeuwen ◽  
...  
Keyword(s):  
Bovine Tuberculosis ◽  
Tuberculin Test ◽  
Elisa Test ◽  
Enzyme Linked Immunosorbent Assay ◽  
Kappa Statistics ◽  
Fisher Exact Test ◽  
Limited Information ◽  
Serum Samples ◽  
Apparent Prevalence ◽  
Kappa Agreement

Bovine tuberculosis (BTB) is an important zoonotic disease which has remained persistent in many areas of the World. Control and eradication has proved problematic due to the challenges in effective screening and diagnosis. Limited information on the status of BTB in Kenya presents a need to investigate its occurrence in cattle population. The study was carried out using an indirect antibody Enzyme Linked Immunosorbent Assay (ELISA-IDEXX-USA) to assess the agreement with Comparative Intradermal Tuberculin Test (CITT) test results between August and December 2013 in Laikipia County. The study also determined the apparent prevalence of cattle BTB antibodies in Laikipia County. A total of 276 bovine serum samples were tested using MPB70 and MPB83 recombinant proteins as capture antigens in the ELISA kit. Data were recorded in Microsoft Excel and exported to SPSS 16.0 for analysis. Apparent prevalence was calculated as a proportion at 95% CI, Kappa statistics computed, and test of significance assessed by Chi-square and Fisher exact test.  The results showed an individual animal apparent prevalence of 3.9% (11/276) and a herd prevalence of 58.3% (7/12). There was no significant association between BTB infection and both animal level factors, breed and sex. Kappa agreement test between ELISA test and TST showed a good agreement at K= 0.65. This study reported the prevalence of BTB in cattle for the first time in Laikipia County Kenya using the IDEXX ELISA. The ELISA test was comparable to the tuberculin test which is used as the gold standard for screening TB on live animals. The two tests can be used alongside for series or parallel interpretation to achieve desirable diagnostic sensitivity and specificity in disease control programs.

scholarly journals A comparison between indirect ELISA and tuberculin skin test in the diagnosis of bovine tuberculosis in Kenya

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Daniel Muasya ◽  
George Karuoya Gitau ◽  
Thaiyah Gitau Andrew ◽  
Daniel Waweru Gakuya ◽  
John Vanleeuwen ◽  
...  
Keyword(s):  
Bovine Tuberculosis ◽  
Tuberculin Test ◽  
Elisa Test ◽  
Enzyme Linked Immunosorbent Assay ◽  
Kappa Statistics ◽  
Fisher Exact Test ◽  
Limited Information ◽  
Serum Samples ◽  
Apparent Prevalence ◽  
Kappa Agreement

Bovine tuberculosis (BTB) is an important zoonotic disease which has remained persistent in many areas of the World. Control and eradication has proved problematic due to the challenges in effective screening and diagnosis. Limited information on the status of BTB in Kenya presents a need to investigate its occurrence in cattle population. The study was carried out using an indirect antibody Enzyme Linked Immunosorbent Assay (ELISA-IDEXX-USA) to assess the agreement with Comparative Intradermal Tuberculin Test (CITT) test results between August and December 2013 in Laikipia County. The study also determined the apparent prevalence of cattle BTB antibodies in Laikipia County. A total of 276 bovine serum samples were tested using MPB70 and MPB83 recombinant proteins as capture antigens in the ELISA kit. Data were recorded in Microsoft Excel and exported to SPSS 16.0 for analysis. Apparent prevalence was calculated as a proportion at 95% CI, Kappa statistics computed, and test of significance assessed by Chi-square and Fisher exact test.  The results showed an individual animal apparent prevalence of 3.9% (11/276) and a herd prevalence of 58.3% (7/12). There was no significant association between BTB infection and both animal level factors, breed and sex. Kappa agreement test between ELISA test and TST showed a good agreement at K= 0.65. This study reported the prevalence of BTB in cattle for the first time in Laikipia County Kenya using the IDEXX ELISA. The ELISA test was comparable to the tuberculin test which is used as the gold standard for screening TB on live animals. The two tests can be used alongside for series or parallel interpretation to achieve desirable diagnostic sensitivity and specificity in disease control programs.

scholarly journals Diversity of Antigen Recognition by Serum Antibodies in Experimental Bovine Tuberculosis

1998 ◽  
Vol 66 (11) ◽  
pp. 5344-5349 ◽  
Author(s):  
Konstantin P. Lyashchenko ◽  
John M. Pollock ◽  
Roberto Colangeli ◽  
Maria Laura Gennaro
Keyword(s):  
Antibody Production ◽  
Bovine Tuberculosis ◽  
Tuberculin Test ◽  
Economic Problem ◽  
Antigen Recognition ◽  
Enzyme Linked Immunosorbent Assay ◽  
Serum Antibodies ◽  
Serum Samples ◽  
Humoral Immune ◽  
Humoral Immune Responses

ABSTRACT Tuberculosis in cattle remains a major zoonotic and economic problem in many countries. The standard diagnostic assay for bovine tuberculosis, the intradermal tuberculin test, has low accuracy. Therefore, alternative immunodiagnostic methods, such as serological assays, are needed for detection of infected animals. Development of an accurate serodiagnostic test requires a detailed understanding of the humoral immune responses during bovine tuberculosis and, in particular, identification of the key antigens of Mycobacterium bovisinvolved in antibody production. In this study, we characterized antibody responses in cattle experimentally infected with M. bovis. Sequential serum samples were collected every 3 to 4 weeks for up to 27 months postinfection. Circulating immunoglobulin G antibody levels were measured by an enzyme-linked immunosorbent assay using 12 highly purified recombinant proteins of M. bovis. Six proteins, ESAT-6, 14-kDa protein, MPT63, MPT70, MPT51, and MPT32, were identified as major seroreactive antigens in bovine tuberculosis. A remarkable animal-to-animal variation of antigen recognition by serum antibodies was observed. Kinetic analyses of the antibody production to individual antigens during infection revealed that the heterogeneous antigen recognition profile changed markedly in a given infected animal as disease progressed.

Foodborne Snow Mountain Agent Gastroenteritis in a School Cafeteria

PEDIATRICS ◽  
1987 ◽  
Vol 79 (4) ◽  
pp. 559-563
Author(s):  
Charles Guest ◽  
Kenneth C. Spitalny ◽  
H. Paul Madore ◽  
Katherine Pray ◽  
Raphael Dolin ◽  
...  
Keyword(s):  
Relative Risk ◽  
Strong Association ◽  
Case Definition ◽  
Enzyme Linked Immunosorbent Assay ◽  
Fisher Exact Test ◽  
Confidence Limits ◽  
Serum Samples ◽  
Exact Test ◽  
Relative Risks ◽  
The Mean

In 1984, an outbreak of gastroenteritis occurred at a school with 1,860 students in Brooklyn, NY. In a single-stage cluster sample of 375 students, 129 (34%) had illnesses that met our case definition of vomiting or diarrhea. The mean incubation period was 26 hours, and the mean illness duration was 24 hours. All case students had eaten in the cafeteria on at least one day between Nov 13 and 16, compared with 174/214 (81%) noncase students (P = 10-8, Fisher exact test). Foods implicated were french fries (relative risk 1.7, 95% confidence limits 1.4, 2.0) and hamburgers (relative risk 1.6, 95%, confidence limits 1.2, 2.1). Two cafeteria employees had served those foods while affected by diarrhea. By a recently developed blocking enzyme-linked immunosorbent assay, six of 11 (55%) case students showed fourfold antibody increases between acute-and convalescent-phase serum samples for Snow Mountain agent, a Norwalk-like virus, compared with one of ten (10%) noncase students (P = .04, Fisher exact test). We strongly suspect, but cannot document conclusively, that the Snow Mountain agent was spread to students on a vector of hot foods contaminated by ill food handlers. Implicated foods conferred low relative risks and could only have accounted for 74% of cases of illness. The strong association between cafeteria exposure and illness, therefore, suggests that additional modes of spread occurred.

Prevalence of bovine tuberculosis in buffaloes in Hyderabad and Tando Allahyar districts of Sindh, Pakistan

2018 ◽  
Author(s):  
Kanwar Kumar Malhi ◽  
Asghar Ali Kamboh ◽  
Chandar Kumar ◽  
Prakash Dewani ◽  
Mukesh Kumar ◽  
...  
Keyword(s):  
Milk Yield ◽  
Bovine Tuberculosis ◽  
Tuberculin Test ◽  
Herd Size ◽  
Enzyme Linked Immunosorbent Assay ◽  
Potential Hazard ◽  
Culture Test ◽  
Milk Samples ◽  
Sindh Province ◽  
Apparently Healthy

An investigation in buffaloes was carried out in Hyderabad and Tando Allahyar districts, Sindh province, Pakistan to determine the prevalence of bovine tuberculosis. The buffaloes (n=120) were first screened through single intradermal tuberculin test (SITT), then their sera were used for enzyme-linked immunosorbent assay (ELISA). Attempts were further made to isolate the Mycobacterium bovis organism from the milk samples using traditional culture test. Overall prevalence of 4.16%, 8.33% and 2.5% was recorded by SITT, ELISA and culture test respectively. A somewhat higher prevalence was recorded in Tando Allahyar district (SITT 6.66%; ELISA 10%; culture test 5%) as compared to Hyderabad district (SITT 1.66%; ELISA 6.66%; culture test 0%). Statistical analysis did not show any association (P> 0.05) of herd size, sex, age, milk yield and farming type with the prevalence of the disease. Whereas, SITT showed a significant (P Less than 0.05) association of sex, age and milk yield with the prevalence of the disease in Tando Allayer district. The results of present study revealed that bovine tuberculosis is present in apparently healthy buffalo herds of Hyderabad and Tando Allayer districts. Moreover, infected animals shed the M. bovis pathogen in milk that could be a potential hazard to public health.

scholarly journals Performance Evaluation of Commercial Dengue Diagnostic Tests for Early Detection of Dengue in Clinical Samples

2017 ◽  
Vol 2017 ◽  
pp. 1-4 ◽  
Author(s):  
Tuan Nur Akmalina Mat Jusoh ◽  
Rafidah Hanim Shueb
Keyword(s):  
Dengue Virus ◽  
Real Time ◽  
Diagnostic Test ◽  
Rapid Diagnostic Test ◽  
Dengue Infection ◽  
Clinical Samples ◽  
Enzyme Linked Immunosorbent Assay ◽  
Rt Pcr ◽  
Serum Samples ◽  
Kappa Agreement

The shattering rise in dengue virus infections globally has created a need for an accurate and validated rapid diagnostic test for this virus. Rapid diagnostic test (RDT) and reverse transcription-polymerase chain reaction (RT-PCR) diagnostic detection are useful tools for diagnosis of early dengue infection. We prospectively evaluated the diagnostic performance of nonstructural 1 (NS1) RDT and real-time RT-PCR diagnostic kits in 86 patient serum samples. Thirty-six samples were positive for dengue NS1 antigen while the remaining 50 were negative when tested with enzyme-linked immunosorbent assay (ELISA). Commercially available RDTs for NS1 detection, RTK ProDetect™, and SD Bioline showed high sensitivity of 94% and 89%, respectively, compared with ELISA. GenoAmp® Trioplex Real-Time RT-PCR and RealStar® Dengue RT-PCR tests presented a comparable kappa agreement with 0.722. The result obtained from GenoAmp® Real-Time RT-PCR Dengue test showed that 14 samples harbored dengue virus type 1 (DENV-1), 8 samples harbored DENV-2, 2 samples harbored DENV-3, and 1 sample harbored DENV-4. 1 sample had a double infection with DENV-1 and DENV-2. The NS1 RDTs and real-time RT-PCR tests were found to be a useful diagnostic for early and rapid diagnosis of acute dengue and an excellent surveillance tool in our battle against dengue.

scholarly journals Seroprevalence and Clinical Presentation of Chikungunya Virus Infection among Febrile Outpatients Seeking Health Care in Mzuzu City, Malawi

2021 ◽  
Author(s):  
Flywell Kawonga ◽  
Gerald Misinzo ◽  
Dylo Pemba ◽  
Leonard Mboera ◽  
Isaac Thom Shawa
Keyword(s):  
Chikungunya Virus ◽  
Clinical Presentation ◽  
Age Groups ◽  
Clinical Signs ◽  
Signs And Symptoms ◽  
Viral Disease ◽  
Elisa Test ◽  
Enzyme Linked Immunosorbent Assay ◽  
Serum Samples ◽  
Igm Antibodies

Chikungunya is a mosquito-borne viral disease caused by Chikungunya virus (CHIKV. We conducted this study determine the seroprevalence and clinical presentation of Chikungunya infection among outpatients seeking healthcare in Mzuzu City, Malawi. Blood samples were collected from malaria negative and non-septic febrile outpatients with fevers ≥38 °C, for not more than 5 days. The enzyme- linked immunosorbent assay (ELISA) test was used to detect anti-CHIKV IgM antibodies and its results were used to determine seroprevalence of Chikungunya. A total of 119 serum samples were tested, of these, 73 (61.3%) tested positive for anti-CHIKV IgM antibodies by ELISA. Laboratory requisition forms were used to capture demographic information such as age, sex, clinical signs and symptoms presented by the enrolled patients. Age groups of 1-9, 10- 19, 20- 29, 30- 39, 40- 49, and ≥50 years had 17.8% (n= 13), 12.3 %,( n=9), 15.1%) (n=11), 19.2%; (n=14), 17.8% (n=13) and 17.8% (n=13) proportion of seroprevalence respectively. Most of the CHIKV infected individuals presented with fever (52.05%), joint pain (45.21%) and abdominal pain (42.67%). The presence of anti- CHIKV IgM antibodies suggest the presence of recent CHIKV infection and therefore accurate laboratory assays are highly recommended for CHIKV diagnosis and appropriate management of febrile patients.

Seroprevalence of Human Cystic Echinococcosis in Sanandaj City, Kurdistan Province, Western Iran

2021 ◽  
Author(s):  
Naser Nazari ◽  
Tooran Nayeri ◽  
Farkhondeh Hazrati
Keyword(s):  
Sex Education ◽  
Cystic Echinococcosis ◽  
Elisa Test ◽  
Enzyme Linked Immunosorbent Assay ◽  
Cluster Sampling ◽  
Serum Samples ◽  
Cystic Hydatid Disease ◽  
Western Iran ◽  
Significant Difference ◽  
Human Cystic Echinococcosis

Background and Aims: Echinococcus granulosus (E. granulosus) is a cestode parasite that causes cystic hydatid disease in humans worldwide. Iran is one of the endemic regions for infection that indicate the importance and presence of infection in this country. Therefore, the current research aimed to characterize the seroprevalence of human cystic echinococcosis in Sanandaj city, Kurdistan province, western Iran. Materials and methods: Totally, 500 serum samples were collected from patients referred to different health centers in Sanandaj city using cluster sampling in 2018-2019. All the sera were examined using the enzyme-linked immunosorbent assay test. Results: The seroprevalence of human hydatidosis was reported at 2.2% by ELISA test in Sanandaj city. This rate was 9 (1.9%) in women and 2 (0.4) in men. The age group of 20-30 years old had the highest positivity rate (1.0%). Also, the subjects that consumed home slaughtered meat had the highest infection rate at 4 (0.8%). There was no significant difference regarding factors studied such as sex, education, residence, consumed water, keeping a dog, and the seropositivity. Conclusions: Seroprevalence of human cystic echinococcosis in Sanandaj city is lower than the general prevalence in Iran. Our research team hopes to provide accurate data on the prevalence of hydatidosis in Sanandaj encourage more extensive research to help prevent this parasite in Iran and worldwide.

A monoclonal-based IgM capture ELISA for detection of antibodies to 22 and 41 kDa membrane antigens ofToxoplasma gondii

Parasitology ◽  
1992 ◽  
Vol 104 (1) ◽  
pp. 25-31 ◽  
Author(s):  
J. L. K. Wee ◽  
L. C. Ho ◽  
E. H. Yap ◽  
M. Singh
Keyword(s):  
Monoclonal Antibody ◽  
Rheumatoid Factor ◽  
Surface Antigens ◽  
Elisa Test ◽  
Enzyme Linked Immunosorbent Assay ◽  
Healthy Individuals ◽  
Serum Samples ◽  
Negative Results ◽  
Coefficients Of Variation ◽  
Membrane Antigens

SUMMARYA murine monoclonal antibody which reacts to 22 and 41 kDaToxoplasma gondiisurface antigens was employed in an IgM capture enzyme-linked immunosorbent assay (ELISA). A total of 125 patients' sera were tested in the monoclonal-based assay. When compared with a commercial ELISA test (Abbott Toxo-M EIA) which uses polyclonal anti-T. gondiiantibodies, good correlation (Pearsons coefficientr= 0.91) was observed. The specificity of the assay was studied by testing a panel of control sera obtained from healthy individuals and blood transfusion donors; all sera gave negative results. Serum samples positive forT. gondiiantibodies were treated with 2-mercaptoethanol (2-ME) to demonstrate the specificity of the test for IgM antibodies. Reactivity of these sera was lost after the treatment. The test is not subject to interference by rheumatoid factor as sera positive for rheumatoid factor were negative in the assay. Reproducibility was good with the coefficients of variation for within-day tests below 10% and not exceeding 18% for day-to-day tests. The monoclonal-based assay is simple to perform and appears to be a viable test for diagnosis ofT. gondiiinfection.

scholarly journals Epidemiologic characterization of bovine tuberculosis in the State of Espírito Santo, Brazil

2016 ◽  
Vol 37 (5Supl2) ◽  
pp. 3567 ◽  
Author(s):  
Jason Onell Ardila Galvis ◽  
José Henrique Hildebrand Grisi-Filho ◽  
Daniele Da Costa ◽  
Alba Luisa Pereira Ribeiro Said ◽  
Marcos Amaku ◽  
...  
Keyword(s):  
Bovine Tuberculosis ◽  
Tuberculin Test ◽  
Reproductive Activity ◽  
Cross Sectional Study ◽  
Fixed Number ◽  
The State ◽  
Cross Sectional ◽  
Espírito Santo ◽  
Apparent Prevalence ◽  
Espirito Santo

A cross-sectional study was carried out between January 2012 and May 2014 to investigate the status of bovine tuberculosis in the state of Espírito Santo. The state was divided into two regions, and in each of them, 300 farms with reproductive activity were randomly selected and considered as the primary sampling units. In the selected farms, a fixed number of female bovines aged over 2 years were randomly selected to undergo a comparative cervical tuberculin test; an epidemiologic questionnaire was also applied. In the state of Espírito Santo, the apparent prevalence of tuberculosis-positive farms was 7.6% (95% confidence interval [CI] = 5.7-9.9). Prevalence at the herd level varied from 4.6% (95% CI = 2.6-7.3) in region 1 to 11.1% (95% CI = 7.7-15.3) in region 2. The apparent prevalence of tuberculosis-positive animals was 0.7% (95% CI = 0.3-1.1) in the state, and the prevalence varied from 0.3% (95% CI = 0.2-0.6) in region 1 to 1.2% (95% CI = 0.3-2.9) in region 2. The risk factors associated with tuberculosis prevalence in Espírito Santo were the number of adult females ? 10 (odds ratio [OR] = 2.40; 95% CI = 1.17-5.31) and milking type (milking machine/milking parlor) (OR = 2.88; 95% CI = 1.36-5.86]). The state of Espírito Santo should set up a surveillance system to detect and control bovine tuberculosis, taking into account the importance of dairy farms and animal trade in the state.

scholarly journals Development and Application of an Enzyme-Linked Immunosorbent Assay to Detect Antibodies against Prevalent Salmonella Serovars in Swine in Southern Brazil

2007 ◽  
Vol 19 (5) ◽  
pp. 510-517 ◽  
Author(s):  
Jalusa Deon Kich ◽  
Patrícia Schwarz ◽  
Luis Eduardo Silva ◽  
Arlei Coldebella ◽  
Itamar Antônio Piffer ◽  
...  
Keyword(s):  
Immunosorbent Assay ◽  
Cost Effective ◽  
Elisa Test ◽  
Enzyme Linked Immunosorbent Assay ◽  
Serum Samples ◽  
Production Chain ◽  
Control Programs ◽  
Serovar Typhimurium ◽  
Commercial Kits ◽  
Swine Herds

The implementation of Salmonella control programs in the pork production chain demands rapid and cost-effective methods to assess the prevalence of infection in pig herds. The objective of the present study was to develop an in-house enzyme-linked immunosorbent assay (ELISA) based on S. Typhimurium lipopolysaccharides (LPS) to measure the prevalence of infection caused by Salmonella in swine herds. Coating antigen was produced by phenol extraction of S. Typhimurium culture. After standardization of ELISA test conditions, the assay was validated by testing serum samples on different animal categories: pigs orally inoculated with S. Typhimurium and sentinel animals in contact with them, naturally infected animals, colostrum-deprived piglets, and bacterin-immunized pigs. Seroconversion was observed in inoculated pigs (7 days postinfection [DPI]) and in the sentinels (21 DPI). Nonspecific reactions were not detected in the sera of colostrum-deprived animals. Serum samples from animals immunized with Salmonella Agona, Salmonella Derby, Salmonella Panama, and Salmonella Bredeney bacterins showed marked cross-reaction with the LPS from the serovar Typhimurium. Moreover, positive results obtained with the in-house ELISA were associated with Salmonella isolation in 75 infected pig herds. Comparisons with 2 commercial kits showed a linear correlation coefficient of 0.847 between the in-house ELISA and kit A and 0.922 with kit B but a low agreement in the qualitative results. In conclusion, the newly developed in-house ELISA based on S. Typhimurium LPS can be a useful tool to determine the intensity of Salmonella sp. infection in swine herds.

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