Abstract
Currently Mycobacterium avium subsp. paratuberculosis (MAP) infection is diagnosed through indirect tests based on the immune response induced by the infection. The antigens commonly used in IFN-γ release assays (IGRA) are purified protein derivative tuberculins (PPD). However, PPDs, lack both specificity (Sp) and sensitivity (Se) in the early phase of infection. This study investigated the potential of 16 MAP recombinant proteins and five lipids to elicit the release of IFN-γ in goats from herds with or without a history of paratuberculosis. Ten recombinant proteins were selected as potential candidates for the detection of MAP infection in young goats. They were found to detect 25 to 75% of infected shedder (IS) and infected non-shedder (INS) kids younger than 10 months of age. In comparison, PPD was shown to detect only 10% of INS and no IS kids. For seven antigens, Se (21–33%) and Sp (≥ 90%) of IGRA were shown to be comparable with PPD at 20 months old. Only three antigens were suitable candidates to detect IS adult goats, although Se was lower than that obtained with PPD. In paratuberculosis-free herds, IGRA results were negative in 97% of indoor goats and 86% of outdoor goats using the 10 antigens. However, 22 to 44% of one-year-old outdoor goats were positive suggesting that they may be infected. In conclusion, this study showed that ten MAP recombinant proteins are potential candidates for early detection of MAP infected goats. Combining these antigens could form a possible set of MAP antigens to optimize the Se of caprine IGRA.
| Original language | English |
|---|---|
| Pages (from-to) | 278-287 |
| Journal | Research in Veterinary Science |
| Volume | 115 |
| DOIs | |
| Publication status | Published - 2017 |
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Keywords
- Antigen
- Early diagnosis
- Goat
- IFN-γ
- Johne's disease
- Mycobacterium avium subsp. paratuberculosis
- Paratuberculosis
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Identification of new antigen candidates for the early diagnosis of Mycobacterium avium subsp. paratuberculosis infection in goats. / Souriau, Armel; Freret, Sandrine; Foret, Benjamin; Willemsen, Peter T.J.; Bakker, Douwe; Guilloteau, Laurence A.
In: Research in Veterinary Science, Vol. 115, 2017, p. 278-287.Research output: Contribution to journal › Article › Academic › peer-review
TY - JOUR
T1 - Identification of new antigen candidates for the early diagnosis of Mycobacterium avium subsp. paratuberculosis infection in goats
AU - Souriau, Armel
AU - Freret, Sandrine
AU - Foret, Benjamin
AU - Willemsen, Peter T.J.
AU - Bakker, Douwe
AU - Guilloteau, Laurence A.
PY - 2017
Y1 - 2017
N2 - Currently Mycobacterium avium subsp. paratuberculosis (MAP) infection is diagnosed through indirect tests based on the immune response induced by the infection. The antigens commonly used in IFN-γ release assays (IGRA) are purified protein derivative tuberculins (PPD). However, PPDs, lack both specificity (Sp) and sensitivity (Se) in the early phase of infection. This study investigated the potential of 16 MAP recombinant proteins and five lipids to elicit the release of IFN-γ in goats from herds with or without a history of paratuberculosis. Ten recombinant proteins were selected as potential candidates for the detection of MAP infection in young goats. They were found to detect 25 to 75% of infected shedder (IS) and infected non-shedder (INS) kids younger than 10 months of age. In comparison, PPD was shown to detect only 10% of INS and no IS kids. For seven antigens, Se (21–33%) and Sp (≥ 90%) of IGRA were shown to be comparable with PPD at 20 months old. Only three antigens were suitable candidates to detect IS adult goats, although Se was lower than that obtained with PPD. In paratuberculosis-free herds, IGRA results were negative in 97% of indoor goats and 86% of outdoor goats using the 10 antigens. However, 22 to 44% of one-year-old outdoor goats were positive suggesting that they may be infected. In conclusion, this study showed that ten MAP recombinant proteins are potential candidates for early detection of MAP infected goats. Combining these antigens could form a possible set of MAP antigens to optimize the Se of caprine IGRA.
AB - Currently Mycobacterium avium subsp. paratuberculosis (MAP) infection is diagnosed through indirect tests based on the immune response induced by the infection. The antigens commonly used in IFN-γ release assays (IGRA) are purified protein derivative tuberculins (PPD). However, PPDs, lack both specificity (Sp) and sensitivity (Se) in the early phase of infection. This study investigated the potential of 16 MAP recombinant proteins and five lipids to elicit the release of IFN-γ in goats from herds with or without a history of paratuberculosis. Ten recombinant proteins were selected as potential candidates for the detection of MAP infection in young goats. They were found to detect 25 to 75% of infected shedder (IS) and infected non-shedder (INS) kids younger than 10 months of age. In comparison, PPD was shown to detect only 10% of INS and no IS kids. For seven antigens, Se (21–33%) and Sp (≥ 90%) of IGRA were shown to be comparable with PPD at 20 months old. Only three antigens were suitable candidates to detect IS adult goats, although Se was lower than that obtained with PPD. In paratuberculosis-free herds, IGRA results were negative in 97% of indoor goats and 86% of outdoor goats using the 10 antigens. However, 22 to 44% of one-year-old outdoor goats were positive suggesting that they may be infected. In conclusion, this study showed that ten MAP recombinant proteins are potential candidates for early detection of MAP infected goats. Combining these antigens could form a possible set of MAP antigens to optimize the Se of caprine IGRA.
KW - Antigen
KW - Early diagnosis
KW - Goat
KW - IFN-γ
KW - Johne's disease
KW - Mycobacterium avium subsp. paratuberculosis
KW - Paratuberculosis
U2 - 10.1016/j.rvsc.2017.05.025
DO - 10.1016/j.rvsc.2017.05.025
M3 - Article
VL - 115
SP - 278
EP - 287
JO - Research in Veterinary Science
JF - Research in Veterinary Science
SN - 0034-5288
ER -