Johne's disease - ZN smear

Interpretation of Johne's Disease Microscopy
The presence of acid/alcohol-fast bacilli forming typical clumps is strongly suggestive of Johne's disease. Where single acid/alcohol-fast bacilli are observed this is considered suspicious of Johne's disease, but not diagnostic.

The sensitivity of this test for clinical Johne's disease is 30%, and the specificity is high where typical clumps of acid/alcohol-fast bacilli are seen. Where negative or suspicious results are obtained it is recommended to screen the animal for antibody to Johne's disease and/or by faecal PCR.


  • Price: £18.20
  • Species: Cattle, Sheep, Goats, Camelid, Deer
  • Disease/presentation: Gastrointestinal disease
  • Test type: Microbiology
  • Sample type(s): Faeces

Further Information

UKAS Accreditation Status: Accredited

Turnaround Time: 1 working day

SRUC VS Product Code(s): 1021500

Johne's disease - ZN smear

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