Mannheimia

Abstract

Mann.hei' mi.a. L. n. fem. Mannheimia named in tribute to the German microbiologist Walter Mannheim. Proteobacteria / Gammaproteobacteria / Pasteurellales / Pasteurellaceae / Mannheimia Gram‐negative, nonmotile rods or coccobacilli. Cell sizes of ∼0.5 × 1.2 μm are similar to those of Pasteurella species. Some species exhibit bipolar staining. Endospores are not formed. Growth is mesophilic and facultatively anaerobic or microaerophilic. Neither X nor V factor is required for growth. Glucose is fermented without gas production. Oxidase reaction is normally positive, but may be variable. Alkaline phosphatase and catalase test is positive, and nitrate is reduced. Simmon's citrate, arginine dihydrolase, and Voges–Proskauer tests are negative, and there is no fermentation of d ‐adonitol or l ‐sorbose. All strains ferment d ‐mannitol. Urease reaction is negative. Trehalose and d ‐mannose are not fermented. Cultural characteristics are typical of those of the family Pasteurellaceae . A zone of β‐hemolysis is commonly observed, depending on media, type of blood, and pH. DNA G + C content (mol%) : 39.2–43.9. Type species : Mannheimia haemolytica Angen et al. 1999 VP (basonym: Pasteurella haemolytica Newsom and Cross 1932 AL ).

Mannheimia pernigra sp. nov., isolated from bovine respiratory tract

“…The genus Mannheimia is one of current 30 genera within the family Pasteurellaceae [1, 2]. While the family has undergone many taxonomic changes and expansions over the last 20 years, the genus Mannheimia has remained quite constant since it was established in 1999 [3].…”