Biosecurity aspects of cattle production in Western Uganda, and associations with seroprevalence of brucellosis, salmonellosis and bovine viral diarrhoea

Table 4 Frequency and prevalence (%) of seropositive cattle herds based on tested young or adult individuals

	Herds with young^a individuals		Herds with adult^a individuals
	n positive herds (n tested)	prevalence positive herds (%)^b	n positive herds (n tested)	prevalence positive herds (%)^b
Brucella	4 (123)	3.3 (0.9;8.1)	21 (137)	15.3 (9.7;22.5)
Salmonella	15 (138)	10.9 (6.2;17.3)	20 (129)	15.5 (9.7;22.9)
BVD	48 (138)	34.8 (26.9;43.4)	40 (89)	44.9 (34.4;55.9)

^ayoung <2 years, adult >2 years
^bWith exact binomial confidence intervals
Prevalence of herds that were sero-positive to brucella, salmonella, and BVDV. A herd was classified as positive if at least one sampled individual animal tested positive in the respective ELISA, using the manufacturers’ cut-offs. The number of sampled animals per herd was; all for herds with up to 20 cattle, 20 for herds with 21 to 50 cattle, and 30 if there were more than 50 cattle. When feasible, individuals up to 2 years of age were sampled. First, samples from seven individuals were tested serologically prioritising young individuals for salmonella and BVD, and older for brucella. If all were negative, for brucella the remaining samples from the herd were analysed. For salmonella another nine samples were analysed, if the herd was still negative any remaining samples were analysed. The study was performed in Western Uganda in 2015

ISSN: 1746-6148