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). Pleomor-

phic 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).