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.