Unadjusted Kaplan-Meier survival curve for FMD cases and non-cases related to developing clinical mastitis. Dairy farm was located in Nakuru County, Kenya. Cattle were included in the analysis if present on the farm during the outbreak period (31st August-28th September 2012) and were followed for 12 months after the commencement of the outbreak. Cattle were included if over the age of 18 months at the start of outbreak, considered as the age when the outcome becomes a possibility. Log-rank test for equality of survivor function, P = 0.43. The Y-axis represents the cumulative probability of not having clinical mastitis.