Klebsiella is a genus of Gram-negative bacteria that is commonly found in the environment and also in the human body. Its name is derived from the German bacteriologist Edwin Klebs, who discovered this type of bacteria. The species within the genus Klebsiella can cause infections in humans, especially those who are immunocompromised or hospitalized. Some of the synonyms for the genus Klebsiella include Friedländer's bacillus, which was named after Carl Friedländer, who discovered it in 1882. Other synonyms include Klebsiella pneumoniae, Klebsiella oxytoca, and Klebsiella rhinoscleromatis. Understanding the various synonyms for the genus Klebsiella is important in the medical field, as it aids in communication and accurate diagnosis of infections caused by these bacteria.