Enhancing bovine tuberculosis screening at Dhaka city in Bangladesh: Integrating gamma interferon blood test as ancillary testing with tuberculin skin test

IF 1.4 3区农林科学 Q4 IMMUNOLOGY Veterinary immunology and immunopathology Pub Date : 2023-10-01 DOI:10.1016/j.vetimm.2023.110659

Robiul Islam , Sk Shaheenur Islam , Tanzida Begum Rumi , Zakaria Mia , Zeaur Rahim

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Abstract

Tuberculin skin test (TST) is the standard method for screening of bovine tuberculosis (bTB). However, gamma interferon blood test has been introduced in the bTB control program as an ancillary testing with TST in many countries of the world. The objective of this study was to recommend this screening test as an ancillary testing with TST for field application in Bangladesh. In this study 577 cattle of different age, sex and breeds from twenty nine (29) cattle herds were examined to determine skin response against bTB through single intradermal comparative tuberculin test (SICTT) that comprised of positive (n = 81), inconclusive (n = 44) and negative (n = 452) animals. Of which 74 animals that included positive (n = 63), inconclusive (n = 8) and negative (n = 3) animals were taken under this study. Blood samples were collected in heparinized tube and stimulated overnight with bovine and avian purified protein derivatives (PPDs) for the secretion of gamma interferon, and measured via sandwich ELISA. Cohen’s kappa statistics was performed for the evaluation of agreement between the two tests. The agreement obtained between two tests was fair (Kappa agreement, K = 24.0%, 95% CI = 16.9−30.5%, P = 0.037). Of positive (n = 63), inconclusive (n = 8) and negative (n = 3) status of animals at SICTT, 82.54% (n = 52), 62.50% (n = 5), and 33.33% (n = 1) were found to be bTB positive respectively through this ancillary test. This test notably corroborates to TST result. A considerable number of inconclusive TB status animals were found to be positive through this gamma interferon assay. Therefore, this test could be used as an ancillary test with TST to maximize the proportion of bTB estimation in the infected cattle herd for early detection of zoonotic tuberculosis in Bangladesh before transmission at the animal-human interface.

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孟加拉国达卡市加强牛结核病筛查：将γ-干扰素血液检测作为辅助检测与结核菌素皮肤检测相结合。

结核菌素皮试（TST）是筛查牛结核病（bTB）的标准方法。然而，在世界许多国家，γ-干扰素血液检测已被纳入结核病控制计划，作为TST的辅助检测。本研究的目的是推荐该筛选测试作为TST的辅助测试，用于孟加拉国的现场应用。在这项研究中，对来自二十九（29）个牛群的577头不同年龄、性别和品种的牛进行了检查，以通过单次皮内比较结核菌素试验（SICTT）确定皮肤对bTB的反应，该试验包括阳性（n=81）、不确定（n=44）和阴性（n=452）动物。其中74只动物，包括阳性（n=63）、不确定（n=8）和阴性（n=3）动物被纳入本研究。将血样收集在肝素化管中，用牛和禽类纯化蛋白衍生物（PPD）刺激过夜以分泌γ干扰素，并通过夹心ELISA进行测量。Cohen的kappa统计用于评估两个测试之间的一致性。两项测试之间的一致性是显著的（Kappa一致性，K=77.7%，95%CI=70-84.5%，P=0.004）。在SICTT的阳性（n=63）、不确定（n=8）和阴性（n=3）动物中，通过该辅助测试分别发现82.54%（n=52）、62.50%（n=5）和33.33%（n=1）的bTB阳性。该试验与TST结果有显著的一致性。通过这种γ-干扰素测定，发现相当多的不确定结核病状态的动物呈阳性。因此，该测试可作为TST的辅助测试，以最大限度地提高受感染牛群中bTB估计的比例，从而在动物-人类界面传播之前，在孟加拉国早期检测人畜共患结核病。

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来源期刊

Veterinary immunology and immunopathology 农林科学-免疫学

CiteScore

3.40

自引率

5.60%

发文量

审稿时长

70 days

期刊介绍： The journal reports basic, comparative and clinical immunology as they pertain to the animal species designated here: livestock, poultry, and fish species that are major food animals and companion animals such as cats, dogs, horses and camels, and wildlife species that act as reservoirs for food, companion or human infectious diseases, or as models for human disease. Rodent models of infectious diseases that are of importance in the animal species indicated above,when the disease requires a level of containment that is not readily available for larger animal experimentation (ABSL3), will be considered. Papers on rabbits, lizards, guinea pigs, badgers, armadillos, elephants, antelope, and buffalo will be reviewed if the research advances our fundamental understanding of immunology, or if they act as a reservoir of infectious disease for the primary animal species designated above, or for humans. Manuscripts employing other species will be reviewed if justified as fitting into the categories above. The following topics are appropriate: biology of cells and mechanisms of the immune system, immunochemistry, immunodeficiencies, immunodiagnosis, immunogenetics, immunopathology, immunology of infectious disease and tumors, immunoprophylaxis including vaccine development and delivery, immunological aspects of pregnancy including passive immunity, autoimmuity, neuroimmunology, and transplanatation immunology. Manuscripts that describe new genes and development of tools such as monoclonal antibodies are also of interest when part of a larger biological study. Studies employing extracts or constituents (plant extracts, feed additives or microbiome) must be sufficiently defined to be reproduced in other laboratories and also provide evidence for possible mechanisms and not simply show an effect on the immune system.