A Legionella-like Bacterium Related to WIGA in a Fatal Case of Pneumonia

Abstract
An unusual bacterium serologically related to a rickettsia-like agent, designated previously as WIGA, was seen in lung tissue from a patient who died of pneumonia of unknown cause. A fluorescent antibody conjugate prepared with the WIGA organism and isolated in 1959 was used to stain the lung tissue. Enormous numbers of fluorescent bacteria in the lungs of this patient confirmed the pathogenicity of this unusual bacterium.