The index case drank unboiled milk from a cow during the week before his symptom onset. None of the 7 herdsmen who worked with him nor his brother’s wife had symptoms; however, a blood sample from one herdsman was positive for anti-RVF-specific IgG and IgM. Neither the index case nor the additional confirmed case-patients slaughtered or butchered any sick/dead animals nor handled abortus; however, some herdsmen did report high-risk exposures to animal body fluids and drinking unboiled milk. Among 55 animal samples collected, 29 (53%) were positive for anti-RVF-IgG.