Factors associated with the seroprevalence of caseous lymphadenitis in sheep from Northeastern Brazil.

•Flock-level and animal-level prevalences of Caseous lymphadenitis in five Northeastern Brazil states were 93.88% (95% CI = 89.60–96.46%) and 37.46% (95% CI = 35.51–39.45%), respectively.•Purebred sheep, ram acquisition from animal expositions, offspring is separated from ewes, water supplied to sheep from ponds, and disposal of infected animals were associated with seroprevalence.•Information and improvement policies for producers regarding disease control and monitoring should be encouraged.