Description of the Pathogen The genus Aeromonas (from the Greek “Aer”: gas; and “Monas”: unit; meaning “gas producing units”) consists of environmental, facultatively anaerobic, gram-negative bacilli that are predominantly motile as a result of a single polar flagellum. Although at…
Acknowledgments We acknowledge the substantial contributions of D.A. Powell, M.J. Marcon, and A. L. Leber to this chapter in previous editions. Microbiology Acinetobacter species are nonmotile, oxidase-negative, catalase-positive, strictly aerobic, gram-negative coccobacilli. Their inability to ferment glucose or to reduce…
Yersinia species are bacteria in the family Enterobacteriaceae. Of 15 species of Yersinia , only Yersinia enterocolitica , Y. pseudotuberculosis , and Y. pestis are human pathogens. Y. enterocolitica and Y. pseudotuberculosis are enteropathogens transmitted by consumption of contaminated food…
Shigella species usually cause acute gastrointestinal tract infection, a clinical syndrome named shigellosis. , The term dysentery denotes colitis manifested as frequent, painful passage of stools containing blood or mucus; bacillary dysentery is caused by a number of invasive bacteria…
Nontyphoidal Salmonella species are found widely in animals and cause a broad spectrum of clinical infections that include asymptomatic carriage, gastroenteritis, bacteremia, and metastatic focal infections. In contrast, Salmonella serotypes Typhi and Paratyphi A, B, and C are human-specific pathogens…
Microbiology The genus Serratia, family Yersiniaceae fam.nov, order Enterobacterales ord.nov (former family Enterobacteriaceae), contains at least 15 species. Serratia marcescens is the primary pathogenic species in humans, but a few cases of human infections are caused by S. liquefaciens ,…
Microbiology and Epidemiology Organisms belonging to the genera Proteus, Providencia, and Morganella are phylogenetically related members of the family Morganellaceae fam.nov , order Enterobacterales ord.nov. (former family Enterobacteriaceae) and are often referred to as the Proteeae. All members of these…
Plesiomonas shigelloides is a common inhabitant of surface water and fish and is a cause of acute gastroenteritis, mainly in travelers to tropical regions, and uncommonly of severe extraintestinal infections in children. Description of Pathogen Microbiology P. shigelloides is the…
Microbiology, Epidemiology, Clinical Manifestations, and Treatment More than 99% of Enterobacterales recovered in clinical laboratories belong to a few dozen species. Three species— Escherichia coli, Proteus mirabilis, and Klebsiella pneumoniae —made up of more than 90% of isolates, and several…
Microbiology And Epidemiology The genus Citrobacter has undergone significant taxonomic revision through the use of newer techniques based on DNA relatedness. The genus contains 13 named species: Citrobacter freundii, C. koseri (formerly C. diversus ) , C. amalonaticus, C. youngae,…