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Table 4 Samples from 90 wild boars, representing 30 local populations, and shot during the regular hunting seasons 2014–2016

From: Distribution of enteropathogenic Yersinia spp. and Salmonella spp. in the Swedish wild boar population, and assessment of risk factors that may affect their prevalence

Population characteristics Total (%) Negative PCR-positive for Salmonella spp. PCR-positive for Y. enterocolitica Y. pseudotuberculosis
Feeding intensity (feeding places/10 km2)
 < 3 11 (12.2) 4 (36.4) 4 (36.4) 2 (18.2) 1 (9.1)
 3–5 40 (44.4) 14 (35.0) 10 (25.0) 18 (45.0) 7 (17.5)
 5–10 9 (10.0) 4 (44.4) 4 (44.4) 0 (0.0) 2 (22.2)
 > 10 30 (33.3) 13 (43.3) 6 (20.0) 8 (26.7) 10 (33.3)
Years since establishment of population (years)
 < 3 1 (1.1) 0 (0.0) 0 (0.0) 1 (100.0) 0 (0.0)
 3–5 5 (5.6) 0 (0.0) 2 (40.0) 4 (80.0) 2 (40.0)
 5–7 10 (11.1) 4 (40.0) 5 (50.0) 3 (30.0) 0 (0.0)
 7–10 5 (5.6) 0 (0.0) 3 (60.0) 2 (40.0) 2 (40.0)
 > 10 69 (76.7) 32 (46.4) 14 (20.3) 18 (26.2) 16 (23.2)
Yearly harvest/10 km2 (animals)
 < 5 6 (6.7) 1 (16.7) 2 (33.3) 4 (66.7) 3 (50.0)
 5–15 18 (20.0) 8 (44.4) 6 (33.3) 5 (27.8) 0 (0.0)
 15–30 15 (16.7) 4 (26.7) 5 (33.3) 6 (40.0) 2 (13.3)
 30–50 22 (24.4) 10 (45.5) 5 (22.7) 5 (22.7) 5 (22.7)
 > 50 29 (32.2) 12 (41.4) 6 (20.7) 8 (27.6) 10 (34.5)
Handling of slaughter waste
 Made unavailable for wildlife 58 (64.4) 22 (37.9) 14 (24.1) 17 (29.3) 17 (29.3)
 Left out in the forest 32a (35.6) 13 (40.6) 10 (31.3) 11 (34.4) 3 (9.4)
  1. The number of wild boars positive for Salmonella spp., Y. enterocolitica and Y. pseudotuberculosis as analysed by PCR, is specified in relation to each population characteristic as defined in a questionnaire
  2. aOnly samples submitted by hunters within this category (68% of hunter-submitted samples)