In addition to the characteristics given for the genus, cells are
short rods (0.5
mm wide and 0.8–1.0 mm long) with polar
flagella. Growth is visible after 24 h incubation on NA at
30
u
C. Colonies on NA are shiny, beige-pigmented, circular
with regular edges. Growth does also occur on TSA or R2A
agar. Growth occurs at 20–40
u
C (optimum, 30–35
C), but
not at 15 or 42
u
C. Growth occurs at pH 6.0–9.0 (optimum,
pH 7.0) and in the presence of 1–4 % NaCl (optimum, 2–
3 %) in NB. No anaerobic growth occurs in NB and on NA
supplemented with potassium nitrate. Nitrate is not reduced
to nitrite. Aesculin, casein, gelatin, agar, starch, urea and
Sisnot
produced. Acid is not produced from
D-glucose, D-mannitol,
Tweens 40, 60 and 80 are not hydrolysed. H
2
u