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Table 4 The seroprevalence of Leptospira Hardjo in individual animals in a Leptospiral seroprevalence study: data presented by region, age, sex and breeding herd size

From: Seroprevalence of Leptospira Hardjo in the Irish suckler cattle population

Category ELISA Negative ELISA Positive Total Tested Apparent Prevalence (%) True Prevalence (%) 95% Confidence Interval
Region 1 558 453 1011 44.81 36.32 34.67 - 37.96
2 518 500 1018 49.12 41.29 39.64 - 42.93
3 436 482 918 52.51 45.20 43.47 - 46.93
4 468 399 867 46.02 37.72 35.94 - 39.49
5 399 489 888 55.07 48.16 46.40 - 49.91
6 330 334 664 50.30 42.66 40.62 - 44.69
Age Unknown 29 37 66 56.06 49.30 42.88 - 55.71
1–2 yrs 763 726 1489 48.76 40.88 39.51 - 42.23
2–3 yrs 207 180 387 46.51 38.28 35.62 - 40.94
3–5 yrs 776 777 1553 50.03 42.35 41.01 - 43.67
5–9 yrs 527 527 1054 50.00 42.31 40.69 - 43.92
>9 yrs 407 410 817 50.18 42.52 40.68 - 44.35
Sex Unknown 29 37 66 56.06 49.30 42.88 - 55.71
Female 2570 2514 5084 49.45 41.67 40.93 - 42.41
Male 110 106 216 49.07 41.23 37.66 - 44.80
Breeding Herd Size ≤13 453 325 778 41.77 32.81 30.95 - 34.67
14–23 824 709 1533 46.25 37.98 36.64 - 39.32
24–32 624 572 1196 47.83 39.80 38.29 - 41.32
33–142 808 1051 1859 56.54 49.85 48.64 - 51.06
ALL 2709 2657 5366 49.52 41.75 41.03 - 42.47