Chapter 41 The Genera Chlamydia and Chlamydophila Members of the order Chlamydiales are gram-negative obligate intracellular bacterial pathogens that parasitize hosts from humans to amebae. The family Chlamydiaceae has recently…
Chapter 17 The Genus Yersinia Yersiniae are oxidase-negative, facultatively anaerobic, catalase-positive, gram-negative rods, members of the family Enterobacte-riaceae. The genus contains seven species, including Yersinia pestis, the causative agent of…
Chapter 23 The Genera Mannheimia and Pasteurella Mannheimia and Pasteurella are members of the class α-Proteobacteria, order Pasteurellales, family Pasteurellaceae, that contain small, facultatively anaerobic, nonmotile, gram-negative rods or coccobacilli…
Chapter 20 The Genera Aeromonas, Plesiomonas, and Vibrio The genera Aeromonas, Plesiomonas, and Vibrio comprise gram-negative, facultatively anaerobic rods in the class γ-Proteobacteria. They ferment glucose and are usually oxidase…
Chapter 7 The Genus Bacillus Bacilli are strictly aerobic or facultatively anaerobic, spore-forming rods (Figure 7-1). Most are catalase positive and motile, many are gram variable, and all are mediumto…
Chapter 43 The Family Rickettsiaceae Rickettsioses are some of the oldest diseases known to man. On one hand, epidemic typhus was responsible for large outbreaks of plaguelike illness in ancient…
Chapter 22 The Genus Actinobacillus Disease associated with members of the genus Actinobacillus(family Pasteurellaceae) was first reported in 1902, in the form of bovine subcutaneous abscesses from which gram-negative rods…
Chapter 30 The Genus Lawsonia Lawsonia intracellularis is the etiologic agent of an intestinal hyperplastic disease called proliferative enteropathy. It is an obligate intracellular pathogen, and has not been cultivated…
Chapter 25 The Genus Brucella Brucellosis was first described by British physician David Bruce, who in 1886 isolated a bacterium from the spleens of patients with a fatal disease known…
Chapter 36 The Genus Dichelobacter The genus Dichelobacter was created to accommodate the former Bacteroides nodosus, the cause of ovine footrot. The genus name derives from the two-clawed hooves of…
