Risk factors for bovine tuberculosis in low incidence regions related to the movements of cattle

BMC Veterinary Research

Table 4 Presence of imported cattle in Scottish cattle herds subject to routine surveillance by bTB case type from 2002 to 2009

	Case Type
	Slaughter		Confirmed positive RHT		Unconfirmed positive RHT		Unconfirmed inconclusive RHT		Negative RHT
Presence of high risk imports:	N	%	N	%	N	%	N	%	N	%
On test date	33	71.7	44	72.1	71	54.6	521	53.3	8110	35.2
Four years prior	36	78.2	50	81.9	94	72.3	661	67.6	11492	49.9
All years prior	40	87.0	50	81.9	99	76.2	709	72.5	12664	55.0
Total matched herds	46	100	61	100	130	100	980	100	23010	100

The number and percentage of herds with imported cattle is shown. The movement history is sequentially expanded from cattle present on the test date to all cattle present up to 4 years prior to the test date and all cattle present in all years prior since inception of the CTS database in 1996.

ISSN: 1746-6148