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Anaerobic Gram-negative rods
In direct smears and in culture
Bacteroides fragilis
Pleomorphic relatively small Gram-negative rods from
a culture on blood agar (Gram stain).
Bacteroides fragilis
Pleomorphic relatively small Gram-negative rods from
a culture on blood agar (Gram stain).
Bacteroides fragilis
Gram-negative rods in pus from an anaerobic abcess
(Gram stain).
Campylobacter fetus
Comma-shaped bacteria in a blood culture, forming
short chains (Gram stain).
Campylobacter fetus
Comma-shaped bacteria in a blood culture, forming
short chains (Gram stain).
Campylobacter jejuni
Very small comma-shaped bacteria in faeces, forming
short chains (Gram stain).
Campylobacter jejuni
Very small comma-shaped micro-aerophilic bacteria
from a faeces culture, sometimes forming short chains
(Gram stain).
Campylobacter jejuni
Small comma-shaped micro-aerophilic bacteria from a
faeces culture (Gram stain).
Campylobacter upsaliensis
In culture forming short chains these micro-aerophilic
bacteria resemble spirochaetes (Gram stain).
Fusobacterium necrophorum
(Previously: Sphaerophorus fundiliformis). Pleomorphic Gram-negative rods with typical swellings in
culture (Gram stain).
Fusobacterium nucleatum
Slender long Gram-negative rods from a culture on
blood agar (Gram stain).
Helicobacter pylori
Curved Gram-negative rods in a biopsy from the
stomach (Silver nitrate stain).
Leptotrichia buccalis
Huge tapered bacilli from a culture on blood agar
(Gram stain).
Mobiluncus curtisii
The smallest of the two Mobiluncus spp. with typical
claw-like Gram-negative curved rods, here from a
culture (Gram stain).
Mobiluncus mulieris
The largest of the two Mobiluncus spp. shows typical
Gram-negative curved rods, here from a cervical swab
(Gram stain).