<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Virginie Roupie</style></author><author><style face="normal" font="default" size="100%">Elena Alonso-Velasco</style></author><author><style face="normal" font="default" size="100%">Sarah Van Der Heyden</style></author><author><style face="normal" font="default" size="100%">Holbert, Sébastien</style></author><author><style face="normal" font="default" size="100%">Duytschaever, Lucille</style></author><author><style face="normal" font="default" size="100%">Patricia Berthon</style></author><author><style face="normal" font="default" size="100%">Iris Van Dosselaer</style></author><author><style face="normal" font="default" size="100%">Willem Van Campe</style></author><author><style face="normal" font="default" size="100%">Laurent Mostin</style></author><author><style face="normal" font="default" size="100%">Franck Biet</style></author><author><style face="normal" font="default" size="100%">S. Roels</style></author><author><style face="normal" font="default" size="100%">Huygen, Kris</style></author><author><style face="normal" font="default" size="100%">David Fretin</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Evaluation of mycobacteria-specific gamma interferon and antibody responses before and after a single intradermal skin test in cattle naturally exposed to M. avium subsp. paratuberculosis and experimentally infected with M. bovis.</style></title><secondary-title><style face="normal" font="default" size="100%">Vet Immunol Immunopathol</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Animals</style></keyword><keyword><style  face="normal" font="default" size="100%">Antibody Formation</style></keyword><keyword><style  face="normal" font="default" size="100%">Cattle</style></keyword><keyword><style  face="normal" font="default" size="100%">Interferon-gamma</style></keyword><keyword><style  face="normal" font="default" size="100%">Interferon-gamma Release Tests</style></keyword><keyword><style  face="normal" font="default" size="100%">Male</style></keyword><keyword><style  face="normal" font="default" size="100%">Mycobacterium avium subsp. paratuberculosis</style></keyword><keyword><style  face="normal" font="default" size="100%">Mycobacterium bovis</style></keyword><keyword><style  face="normal" font="default" size="100%">Paratuberculosis</style></keyword><keyword><style  face="normal" font="default" size="100%">Real-Time Polymerase Chain Reaction</style></keyword><keyword><style  face="normal" font="default" size="100%">Tuberculin Test</style></keyword><keyword><style  face="normal" font="default" size="100%">Tuberculosis, Bovine</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2018</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2018 Feb</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">196</style></volume><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;This study reports on the diagnostic potential of IFN-γ release assays and serology for Mycobacterium bovis in six naturally M. avium subsp. paratuberculosis (Map) exposed bulls of which four were intratracheally infected with a Belgian field strain of M. bovis. Heparinized blood, serum and fecal samples were collected at regular time intervals for mycobacteria-specific IFN-γ release assays, antibody analysis and for Map culture respectively. Single intradermal skin test (SIT) with bovine tuberculin (PPD-B) was performed on day 115 and animals were sacrificed on day 133 after M. bovis infection. Organs were collected and stored for histopathological examination, modified Ziehl-Neelsen staining and bacteriological analysis of M. bovis and Map by culture and RT-PCR. Prior to infection five animals showed positive IFN-γ responses to avian PPD (PPD-A) and four were positive in Map PCR (IS900) on faeces. Three M. bovis infected animals reacted as early as day 14 with sustained higher PPD-B than PPD-A specific IFN-γ responses, whereas the fourth animal (with the strongest PPD-A response prior to infection) showed sustained higher PPD-B specific IFN-γ levels only a day 56 after infection. Two of the infected animals had a sustained positive IFN-γ response to the ESAT-6/CFP-10/TB7.7 (QuantiFERON-TB Gold) peptide cocktail as early as day 14, among which the animal with the initial high PPD-A response. Later during infection, positive responses were found to ESAT-6 peptides in three infected bulls and to CFP-10 peptides in all four infected bulls. One of the control animals reacted intermittently to the ESAT-6/CFP10/TB7.7 cocktail. Prior to SIT, weak but positive MPB83/MBP70 specific antibody responses were detected in two of the infected bulls. All four M. bovis infected bulls reacted with a positive skin test and showed, as reported by others, increased mycobacteria specific IFN-γ production and increased positive responses in MPB83/MBP70 specific serology after SIT. At autopsy, M. bovis lesions were detected in all four experimentally infected bulls. Our results indicate that in Map exposed cattle, M. bovis diagnosis using IFN-γ assays needs a combination of PPD-B/A and ESAT-6/CFP10 for early and optimal sensitivity and that sensitivity of MPB83/MBP70 serodiagnosis is dramatically increased by prior skin testing. Map exposure did not interfere with the development of SIT in M. bovis infected animals, but resulted in a false positive M. bovis specific IFN-γ and antibody response after SIT in one of the two control animals (which remained negative in skin-test).&lt;/p&gt;
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