Volume 23, Number 12—December 2017
Dispatch
West Nile Virus Lineage 2 in Horses and Other Animals with Neurologic Disease, South Africa, 2008–2015
Table 1
Category | No. (%) horses |
||||||||
---|---|---|---|---|---|---|---|---|---|
2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | Total | |
Total specimens | 71 | 76 | 150 | 164 | 89 | 138 | 193 | 188 | 1,069 |
Confirmed WNV positive† | 9 (12.7) | 6 (7.9) | 18 (12.0) | 12 (7.3) | 3 (3.4) | 4 (2.9) | 23 (11.9) | 4 (2.1) | 79 (7.4) |
WNV PCR positive† | 5 (7.0) | 3 (3.9) | 8 (5.3) | 2 (1.2) | 0 (0) | 1 (0.7) | 4 (2.1) | 1 (0.5) | 24 (2.2) |
WNV IgM positive† | 5 (7.0) | 3 (3.9) | 12 (8.0) | 10 (6.1) | 3 (3.4) | 3 (2.2) | 20 (10.4) | 3 (1.6) | 59 (5.5) |
Deaths‡ | 5 (55.6) | 3 (50.0) | 8 (44.4) | 3 (25.0) | 1 (33.3) | 1 (25.0) | 5 (21.7) | 1 (25.0) | 27 (34.2) |
Any neurologic signs‡ | 8 (88.9) | 6 (100.0) | 16 (88.9) | 11 (91.7) | 2 (66.7) | 4 (100.0) | 21 (91.3) | 4 (100.0) | 72 (91.1) |
Fever‡ | 2 (22.2) | 2 (33.3) | 3 (16.7) | 6 (50.0) | 1 (33.3) | 1 (25.0) | 10 (43.5) | 3 (75.0) | 28 (35.4) |
Co-infections‡ and co-infecting viruses | 2 (22.2), 2 AHSV | 2 (33.3), 2 SINV | 1 (5.6), 1 SHUV | 2 (16.7), 2 MIDV | 2 (66.7), 1 AHSV, 1 SINV | 0 | 4 (17.4), 2 MIDV, 1 SHUV, 1 EEV | 1 (25.0), 1 SHUV | 14 (17.7), 3 AHSV, 3 SINV, 3 SHUV, 4 MIDV, 1 EEV |
*AHSV, African horse sickness virus; EEV, equine encephalitis virus; MIDV, Middleburg virus; SHUV, Shuni virus; SINV, Sindbis virus; WNV,
West Nile virus.
†Percentage of total number of specimens tested.
‡Percentage of total number of confirmed WNV-positive cases. Confirmed cases were those that tested positive by PCR plus those that tested positive by WNV IgM Capture ELISA (IDEXX Laboratories, Montpellier, France) followed by neutralization assay.
Page created: November 16, 2017
Page updated: November 16, 2017
Page reviewed: November 16, 2017
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