Can Legionella infect animals?
Elevated serum antibody levels have been found in horses. A fatal case of pneumonia due to L. pneumophila was diagnosed in a calf. However, only 1.7% (2/112) of the other cattle in the herd had serological evidence of exposure to Legionella (antibody blood test). The disease was linked to exposure to a hot water system colonized with Legionella.
Fabbi M, Castellani-Pastoris M, Scanziani E, et al. Epidemiological and environmental investigations of Legionella pneumophila infection in cattle and case report of fatal pneumonia in a calf. J Clin Microbiol 1998; 36(7):1942-1947.