Spiral, native thermotolerant Campylobacter strains transform, into spherical forms (coccoid) in unfavorable conditions. Electron microscopy, PCR and traditional microbiological methods were applied to "perform complex research in order to clarify whether Campylobacter spherical cells are sort of dormant form or rather degenerative form. It was found that during incubation of Campylobacter suspension in saline coccoid cells were formed and soon afterwards became damaged with the rate proportional to the temperature of incubation. Besides, during this process the sensitivity of Campylobacter assay byPCR gradually falls due to DNA degradation. The results indicate that Campylobacter coccoid forms may be recognized as an intermediate form during the death of bacterial population. For this reason such forms cannot be considered as "viable but nonculturable" forms often found in other species.
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