The Use of Rose Bengal Plate Test to Asses Cattle Exposure to Brucella Infection in Traditional and Smallholder Dairy Production Systems of Tanga Region of Tanzania

Table 2

The prevalence (with exact $\pm 95\%$ confidence intervals) of animal and herd-level seropositivity for Brucella by production system (May 2003–January 2004).

	Herd-level		Animal-level
Production system	Number positives	Seroprevalence, $\%$ ($\pm \mathrm{\hspace{0.17em}\hspace{0.17em}}95\%$ CI)	Number positives	Seroprevalence,$\%$ ($\pm \mathrm{\hspace{0.17em}\hspace{0.17em}}95\%$CI)
Traditional	$\mathit{5}$	20.0 (13.8–26.2)	$\mathit{18}$	7.3 (3.1–12.0)
Smallholder dairy	$\mathit{11}$	10.5 (8.2–11.8)	$\mathit{17}$	4.1 (1.9–7.6)
Overall	$\mathit{16}$	12.3 (10.1–13.9)	$\mathit{35}$	5.3 (3.1–7.8)

CI: lower and upper limits for $95$ percent confidence interval of the seroprevalence.