Ewing.el' la
. M.L. dim. ending ‐
ella
; M.L. fem. n.
Ewingella
named to honor William H. Ewing an American bacteriologist who made many contributions to the nomenclature and classification of the families
Enterobacteriaceae
and
Vibrionaceae
.
Proteobacteria / Gammaproteobacteria / Enterobacteriales / Enterobacteriaceae / Ewingella
Small rod‐shaped cells, 0.6–0.7 × 1–1.8 µm, conforming to the general definition of the family
Enterobacteriaceae
. Contains the enterobacterial common antigen. Motile by 3–10 peritrichous flagella. Facultatively anaerobic. Gram negative, oxidase negative, catalase positive.
Some strains grow faster and are more active biochemically at 25°C than 36°C. Positive reactions for methyl red, Voges–Proskauer, citrate utilization
(
Simmons
),
ONPG test, nitrate reduction to nitrite, and acid production from
D
‐glucose
,
d
‐
mannitol, salicin, trehalose
,
d
‐
arabitol
,
d
‐
mannose, and
D
‐galactose
. Utilize 35 of 156 carbon sources. Negative reactions for indole production, H
2
S production (TSI), urea hydrolysis, phenylalanine deaminase, lysine decarboxylase, arginine dihydrolase, ornithine decarboxylase, gelatin hydrolysis (22°C), growth in KCN, malonate utilization, acetate utilization, lipase (corn oil), DNase production, pigment production, and fermentation of sucrose, dulcitol, adonitol,
myo
‐inositol,
D
‐sorbitol,
L
‐arabinose, raffinose, maltose,
D
‐xylose, cellobiose, α‐methyl‐
D
‐glucoside, erythritol, melibiose, and mucate. No visible gas is produced during fermentation. Susceptible to colistin, nalidixic acid, sulfadiazine (most strains), gentamicin, streptomycin, kanamycin, tetracycline, chloramphenicol, and carbenicillin (disk diffusion method on Mueller‐Hinton agar);
resistant to penicillin and cephalothin
; variable susceptibility to ampicillin.
The mol
%
G
+
C of the DNA is
: 53.6–55.2.
Type species
:
Ewingella americana
Grimont, Farmer, Grimont, Asbury, Brenner and Deval 1984a, 91 (Effective publication: Grimont, Farmer, Grimont, Asbury, Brenner and Deval 1983a, 41.)