Development of a diagnostic compatible BCG vaccine against Bovine tuberculosis

Bovine tuberculosis (BTB) caused by Mycobacterium bovis remains a major problem in both the developed and developing countries. Control of BTB in the UK is carried out by test and slaughter of infected animals, based primarily on the tuberculin skin test (PPD). Vaccination with the attenuated strain...

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Veröffentlicht in:Scientific reports 2019-11, Vol.9 (1), p.17791, Article 17791
Hauptverfasser: Chandran, Aneesh, Williams, Kerstin, Mendum, Tom, Stewart, Graham, Clark, Simon, Zadi, Sirine, Lanni, Faye, McLeod, Neil, Williams, Ann, Villarreal-Ramos, Bernardo, Vordermeier, Martin, Maroudam, Veerasamy, Prasad, Aravind, Bharti, Neeraj, Banerjee, Ruma, Manjari Kasibhatla, Sunitha, McFadden, Johnjoe
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container_issue 1
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container_title Scientific reports
container_volume 9
creator Chandran, Aneesh
Williams, Kerstin
Mendum, Tom
Stewart, Graham
Clark, Simon
Zadi, Sirine
Lanni, Faye
McLeod, Neil
Williams, Ann
Villarreal-Ramos, Bernardo
Vordermeier, Martin
Maroudam, Veerasamy
Prasad, Aravind
Bharti, Neeraj
Banerjee, Ruma
Manjari Kasibhatla, Sunitha
McFadden, Johnjoe
description Bovine tuberculosis (BTB) caused by Mycobacterium bovis remains a major problem in both the developed and developing countries. Control of BTB in the UK is carried out by test and slaughter of infected animals, based primarily on the tuberculin skin test (PPD). Vaccination with the attenuated strain of the M. bovis pathogen, BCG, is not used to control bovine tuberculosis in cattle at present, due to its variable efficacy and because it interferes with the PPD test. Diagnostic tests capable of Differentiating Infected from Vaccinated Animals (DIVA) have been developed that detect immune responses to M. bovis antigens absent in BCG; but these are too expensive and insufficiently sensitive to be used for BTB control worldwide. To address these problems we aimed to generate a synergistic vaccine and diagnostic approach that would permit the vaccination of cattle without interfering with the conventional PPD-based surveillance. The approach was to widen the pool of M. bovis antigens that could be used as DIVA targets, by identifying antigenic proteins that could be deleted from BCG without affecting the persistence and protective efficacy of the vaccine in cattle. Using transposon mutagenesis we identified genes that were essential and those that were non-essential for persistence in bovine lymph nodes. We then inactivated selected immunogenic, but non-essential genes in BCG Danish to create a diagnostic-compatible triple knock-out ΔBCG TK strain. The protective efficacy of the ΔBCG TK was tested in guinea pigs experimentally infected with M. bovis by aerosol and found to be equivalent to wild-type BCG. A complementary diagnostic skin test was developed with the antigenic proteins encoded by the deleted genes which did not cross-react in vaccinated or in uninfected guinea pigs. This study demonstrates the functionality of a new and improved BCG strain which retains its protective efficacy but is diagnostically compatible with a novel DIVA skin test that could be implemented in control programmes.
doi_str_mv 10.1038/s41598-019-54108-y
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Control of BTB in the UK is carried out by test and slaughter of infected animals, based primarily on the tuberculin skin test (PPD). Vaccination with the attenuated strain of the M. bovis pathogen, BCG, is not used to control bovine tuberculosis in cattle at present, due to its variable efficacy and because it interferes with the PPD test. Diagnostic tests capable of Differentiating Infected from Vaccinated Animals (DIVA) have been developed that detect immune responses to M. bovis antigens absent in BCG; but these are too expensive and insufficiently sensitive to be used for BTB control worldwide. To address these problems we aimed to generate a synergistic vaccine and diagnostic approach that would permit the vaccination of cattle without interfering with the conventional PPD-based surveillance. The approach was to widen the pool of M. bovis antigens that could be used as DIVA targets, by identifying antigenic proteins that could be deleted from BCG without affecting the persistence and protective efficacy of the vaccine in cattle. Using transposon mutagenesis we identified genes that were essential and those that were non-essential for persistence in bovine lymph nodes. We then inactivated selected immunogenic, but non-essential genes in BCG Danish to create a diagnostic-compatible triple knock-out ΔBCG TK strain. The protective efficacy of the ΔBCG TK was tested in guinea pigs experimentally infected with M. bovis by aerosol and found to be equivalent to wild-type BCG. A complementary diagnostic skin test was developed with the antigenic proteins encoded by the deleted genes which did not cross-react in vaccinated or in uninfected guinea pigs. 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Control of BTB in the UK is carried out by test and slaughter of infected animals, based primarily on the tuberculin skin test (PPD). Vaccination with the attenuated strain of the M. bovis pathogen, BCG, is not used to control bovine tuberculosis in cattle at present, due to its variable efficacy and because it interferes with the PPD test. Diagnostic tests capable of Differentiating Infected from Vaccinated Animals (DIVA) have been developed that detect immune responses to M. bovis antigens absent in BCG; but these are too expensive and insufficiently sensitive to be used for BTB control worldwide. To address these problems we aimed to generate a synergistic vaccine and diagnostic approach that would permit the vaccination of cattle without interfering with the conventional PPD-based surveillance. The approach was to widen the pool of M. bovis antigens that could be used as DIVA targets, by identifying antigenic proteins that could be deleted from BCG without affecting the persistence and protective efficacy of the vaccine in cattle. Using transposon mutagenesis we identified genes that were essential and those that were non-essential for persistence in bovine lymph nodes. We then inactivated selected immunogenic, but non-essential genes in BCG Danish to create a diagnostic-compatible triple knock-out ΔBCG TK strain. The protective efficacy of the ΔBCG TK was tested in guinea pigs experimentally infected with M. bovis by aerosol and found to be equivalent to wild-type BCG. A complementary diagnostic skin test was developed with the antigenic proteins encoded by the deleted genes which did not cross-react in vaccinated or in uninfected guinea pigs. This study demonstrates the functionality of a new and improved BCG strain which retains its protective efficacy but is diagnostically compatible with a novel DIVA skin test that could be implemented in control programmes.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>31780694</pmid><doi>10.1038/s41598-019-54108-y</doi><oa>free_for_read</oa></addata></record>
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source MEDLINE; Nature Free; DOAJ Directory of Open Access Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; PubMed Central; Alma/SFX Local Collection; Free Full-Text Journals in Chemistry; Springer Nature OA Free Journals
subjects 13/106
38/22
38/23
38/77
45/29
45/41
45/70
631/326/2521
631/326/590/1867
96/109
96/44
Animals
Antigens
Bacillus Calmette-Guerin vaccine
BCG
BCG Vaccine - genetics
BCG Vaccine - immunology
Cattle
Cross Reactions
Developing countries
Gene Knockout Techniques
Guinea Pigs
Humanities and Social Sciences
Immune response
Immunization
Immunogenicity
LDCs
Lymph nodes
Macrophages - metabolism
Macrophages - microbiology
multidisciplinary
Mycobacterium bovis - genetics
Mycobacterium bovis - immunology
Science
Science (multidisciplinary)
Skin tests
Transduction, Genetic
Transposon mutagenesis
Tuberculin
Tuberculin - genetics
Tuberculin - immunology
Tuberculin Test
Tuberculosis
Tuberculosis - diagnosis
Tuberculosis - microbiology
Tuberculosis - veterinary
Tuberculosis, Bovine - diagnosis
Tuberculosis, Bovine - microbiology
Vaccination
Vaccines
Vaccines, Attenuated - immunology
title Development of a diagnostic compatible BCG vaccine against Bovine tuberculosis
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