ANNUAL REPORT 2014/2015

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OSPRI | DISEASE CONTROL 2014/2015 DEER Infected deer herds At 30 June 2015, there were two infected deer herds (0.08% of the total farmed deer herd population). Both herds were located in South Island VRAs. Figure 4 shows that since June 2003, there has been a relatively steep decline in the number of infected herds and then a levelling off at very low numbers since June 2011. The reduction since 2003/2004 is largely due to maintaining low possum densities over large areas of New Zealand. It also reflects a period when there was a large reduction in the number of deer being farmed due to low financial returns for venison and velvet. Ferret trapping in TB risk areas, and testing policy changes aimed at clearing infected herds more quickly, also contributed to the decrease early in this period, particularly in the Canterbury and Otago VRAs. It is expected that the number of infected deer herds will continue to remain low. Deer testing and reactors Deer testing data is summarised in Table 5, which compares the number of TB tests performed and the number of reactors with tests in 2013/2014 and 2014/2015. In the year to 30 June 2015, 252,551 primary mid-cervical intradermal tuberculin tests (skin tests) were performed on deer compared with 252,682 in 2013/2014. During the year, 1240 deer tested positive to the mid-cervical skin test and 207 of these were slaughtered without further testing. The remaining 1033 deer were administered serial ancillary tests including: • comparative cervical skin tests on 110 deer, with no positive animals, and • ETB or Modified ETB (IgG1 ELISA) tests on 923 deer, of which 27 (3%) tested positive and were declared TB reactors. On slaughter, two (7%) of the TB reactors were found to have TB lesions or M. bovis. confirmed. No ancillary parallel ELISA tests were performed on deer in 2014/2015. A crude mid-cervical test specificity of 99.9% can be derived from this data (deer positive to the primary test as a percentage of deer tested, assuming all test positives were not infected). Figure 5 shows the trend in deer reactors from 2002/2003 to 2014/ 2015 by TB risk status area. Future reactor deer numbers are expected to fluctuate between 150 and 400. Tuberculous deer The number of tuberculous deer includes the total number of deer (including reactors and deer found during routine slaughter) with visible TB-like lesions – or otherwise identified as infected following PCR assay or culture of M. bovis from tissues. During 2014/2015, there were three reactors with visible TB lesions and one animal found with TB lesions during routine slaughter. Figure 6 shows the trend in the number of tuberculous deer between 2002/2003 and 2014/2015. Table 5: Deer TB testing results for 2013/2014 and 2014/2015 Deer testing 2013/2014 2014/2015 Primary tuberculin tests on deer 252,682 252,551 Deer positive to primary mid-cervical test 1925 1240 Primary test-positive deer slaughtered 165 207 Primary test-positive deer ancillary serial tested 1760 1033 Ancillary serial test-positive deer 66 27 Ancillary parallel test-positive deer 0 0 Total deer reactors slaughtered 231 (9/10,000) 234 (9/10,000) 56
OSPRI | DISEASE CONTROL 2014/2015 Figure 4: Number of infected deer herds Infected deer herds 80 70 60 50 40 30 20 Infected deer herds in VFAs Infected deer herds in VRAs Total infected deer herds 10 0 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 Year ending June Figure 5: Number of deer TB reactors TB reactors 1600 1400 1200 1000 800 600 TB reactor deer in VFAs TB reactor deer in VRAs Total TB reactor deer 400 200 0 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 Year ending June Figure 6: Number of tuberculous deer 600 VFA 500 VRA 400 Total TB deer 300 200 100 0 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 Year ending June 57
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