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Table 2 Statistically significant clusters of herds with a high within-herd prevalence of BVDV and BoHV-1 in the state of Paraíba, Northeastern Brazil

From: Spatial analysis for bovine viral diarrhea virus and bovine herpesvirus type 1 infections in the state of Paraíba, northeastern Brazil

Radius (km)

No. of herds in cluster

No. of cases in cluster

RRa

p-value

Observed

Expected

BVDV

24.10b

11

55

25.87

2.21

< 0.001

2.11

2

8

2.59

3.11

0.045

0

1

13

4.53

2.90

0.004

0

1

10

3.23

3.12

0.005

0

1

10

3.23

3.12

0.005

0

1

10

3.23

3.12

0.005

BoHV-1

77.17

103

359

297.39

1.27

< 0.001

  1. aRelative risk
  2. bPrimary cluster