Skip to main content

Table 1 Distribution of scores according to serological status.

From: Salmonella dublinin Danish Dairy Herds: Frequency of Change to Positive Serological Status in Bulk Tank Milk ELISA in Relation to Serostatus of Neighbouring Farms

 

Number of Herds (%)*

Number of GR-scores (%)*

Mean GR-scores*

P-value

All Herds

1429 (100)

3697 (100)

2.6

 

Herds test-negative in all rounds

1058 (74.0)

2251 (60.9)

2.1

 

Herds test-positive in all rounds

143 (10.0)

689 (18.6)

4.8

0.0000

Herds changing from test-positive to test-negative

55 (3.8)

197 (5.3)

3.6

0.0003

Herds changing form test-negative to test-positive

117 (8.2)

394 (10.7)

3.4

0.0001

Herds fluctuating from test-negative to test-positive to test-negative and reverse

56 (3.9)

166 (4.5)

3.0

0.0330

  1. *The number of herds, GR-scores, and mean GR-scores are stated according to whether the herds tested negative in all test-rounds, tested positive in all test-rounds or changed test-status during the study period. The GR-scores were divided into 4 groups: repeatedly positive herds, herds changing from positive to negative, herds changing from negative to positive, and herds fluctuating from negative to positive and reverse. The groups were compared to the repeatedly negative herds using chi-square.
Back to article page

Acta Veterinaria Scandinavica

ISSN: 1751-0147