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Table 2 Mean herd size, L. hardjo percentage positivity (PP) reading in bulk tank milk, and prevalence of L. hardjo-positive herds in a survey of anti-Leptospira antibody in bulk tank milka

From: Prevalence of antibodies to Leptospira interrogans serovar hardjoin bulk tank milk from unvaccinated irish dairy herds

Category

No. of herds

Mean herd size (se)

Mean L. hardjopercentage positivity (se)

No. of herds with PP > 60 (% herds)

Herd sizeb

    

10 - 30

79

25 (0.90)

62.8 (2.79)

54 (68)

31 - 60

198

44 (0.57)

72.4 (1.76)

157 (79)

61 - 99

52

76 (1.10)

80.2 (3.44)

47 (90)

>100

9

110 (2.66)

81.4 (8.27)

8 (89)

Province

    

Connaught

11

38 (6.07)

63.3 (7.29)

8 (75)

Ulster

20

41 (4.50)

85.1 (5.65)

19 (95)

Munster

239

45 (1.31)

68.8 (1.64)

179 (75)

Leinster

68

52 (2.42)

78.4 (2.88)

59 (87)

Overall

338

46 (1.10)

71.7 (1.38)

265 (78)

  1. aFigures for herd size were unavailable for nine herds; results for these herds were omitted from the Table.
  2. bData are presented categorised according to herd size and province.