Other organisms that cause lobar pneumonia are Legionella pneumophila and Klebsiella pneumoniae. These are "Escherichia coli", "Klebsiella pneumoniae", and "Proteus mirabilis". Colistin has been effective in treating infections caused by "Pseudomonas, Escherichia", and "Klebsiella" species. These may involve bacteria such as "Pseudomonas aeruginosa", "Klebsiella pneumoniae", or "Acinetobacter". "Escherichia coli" is the single most common microorganism, followed by "Klebsiella" and "Proteus" spp. Numerous pathogens, including enterococci, "Streptococcus pyogenes" and "Klebsiella pneumoniae" (quinolone-resistant) now exhibit resistance. For instance, some "Klebsiella pneumoniae" strains are carbapenem resistant. "Klebsiella" and "Proteus" spp., are frequently associated with stone disease. Pneumonia caused by "Klebsiella" may have bloody sputum often described as "currant jelly". "E. coli" isolates and the large majority of ESBL and MDR isolates of "Klebsiella" species. More specific treatments of "Klebsiella" pneumonia are given in its section above. The species of "Klebsiella" are all gram-negative and usually non-motile. "Klebsiella" organisms are often resistant to multiple antibiotics. In addition to certain "Klebsiella" spp. The bacterial genus "Klebsiella" is named in honor of his work.