Investigation into the Prevalence of Cryptosporidium Infection in Calves among Small-Holder Dairy and Traditional Herds in Tanzania

Table 2

Cryptosporidiosis prevalence (with exact ±95% confidence intervals) in calves up to 3 months of age by production system (May 2003–January 2004).

Production system	Herd level		Animal level
	Number positives	Prevalence, % (±95%CI)	Number positives	Prevalence, % (±95%CI)
Traditional	10	63 (51.5–74.4)	15	22.4 (17.8–26.2)
Smallholder dairy	14	50 (40.7–59.3)	26	52 (45.1–58.9)
Overall	24	54.5 (45.6–60.4)	41	35 (30.9–39.1)

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