VetBact logo


Swedish University of Agricultural Sciences

Veterinary bacteriology: information about important bacteria
Veterinary bacteriology

Species/Subspecies: Campylobacter jejuni subsp. jejuni
Categories: Zoonotic; motile; notifiable diseases and bacteria
Etymology: Genus name: a curved rod.
Species epithet: of jejunum (the middle part of the small intestine).
Subspecies epithet: see Species epithet.
Significance:  [Very important]   
Alternative Species Name(s):Vibrio jejuni, Campylobacter fetus subsp. jejuni.
Type Strain: ATCC 33560 = CCUG 11284 = NCTC 11351.
Macromorphology (smell):
Small, gray and translucent colonies (1-2 mm in diameter) with butter-like consistency. The colonies have smooth edges but irregular shape. The colonies can also be larger and spread to a continuous film ("swarming").
Curved (seagull wing shaped) or spiral shaped small motile rods (0.2-0.8 x 0.5-5 µm) with polar flagella. The motility is darting and corkscrew-like.
Gram +/Gram -:
Metabolism: Microaerophilic
Other Enzymes: Hippuricase + (hippurate +), urease -. Cf. other Campylobacter spp.
Biochemical Tests: Hydrogen sulfide (H2S) +
Fermentation of carbohydrates: Campylobacter spp. can neither ferment nor oxidize carbohydrates.
Spec. Char.: Thermotolerant. Does not grow at 25°C, but at 42°C.
Special Media:
Campylobacter jejuni  
CCD agar (or modified CCD agar) is used for selective isolation of Campylobacter spp. These colonies are white with metallic sheen and an smoth, but irregular, edge. The colonies on CCD agar are great (up to 1 cm in diameter).
Reservoir: Birds and mammals (not humans)
HostsDiseaseClinical picture
HumansCampylobacteriosis, zoonotic disease Food poisoning, with diarrhea, vomiting, abdominal pain and fever. Complications such as rheumatoid arthritis and Guillain Barré occur in rare cases
Cattle, sheepAbortionSporadic abortions
Virulence Factors: Adhesins, cytotoxin, entertoxin, flagella, LPS and siderophore
Diagnostics:Direct culture on selective media or culture after selective enrichment. Confirmation by MALDI-TOF, PCR or other molecular methods. Biochemical tests can also be used for confirmation.
Genome Sequence:
Acc-noStrainSize (bp)Genome
NC_002163 NCTC 11168 1 641 481 1c + 0 
Tre stammar har sekvenserats och de har upp tiil 2 cirkulära plasmider.

16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
L14630 CCUG 24567 1 458 

About 40 species have been described within in the genus Campylobacter and some of these are further divided into subspecies. This genus is closely related to the following genera: Sulfurospirillum, Arcobacter and Helicobacter. C. jejuni is closely related to C. lari and C. volucris.

Findings of thermotolerant Campylobacter in broiler are in Sweden notifiable to the Swedish Board of Agriculture and the County Administrative Board. Campylobacter jejuni belongs to category B as a potential bioterrorism agent according to NIAID.

In Sweden, human campylobacteriosis is notifiable to the Public Health Agency of Sweden.

Comment:Can be differentiated from subsp. doylei, which does not grow at 42°C.
Reference(s): No. 15, 34, 58


New names of bacterial phyla

The taxonomic category phylum was previously not regulated by the International Code of Nomenclature of Prokaryotes (ICNP), but now this has changed and it was decided to revise the names of bacterial phyla. All phyla must be written in italics (which has been done on VetBact also before) and have the ending -ota.

Published 2023-03-01. Read more...
The taxonomy of chlamydias

Species within the family Chlamydiaceae were previously divided into two genera Chlamydia and Chlamydophila. However, the differences between these two genera were not that great and many research groups have not accepted this division. Therefore, the genus Chlamydophila has been returned to the genus Chlamydia and this change has now been incorporated in VetBact

Published 2023-03-15. Read more...

Recently Updated

Recent blog posts

Most recent comment

Swedish University of Agricultural Sciences