Abstract: Pork that had been stored for 15 days at －18 ℃ was thawed to count harmful bacteria using different selective culture media, typical colonies growing on culture medium plates were separated and preliminarily identified, and an investigation into the regrowth of various harmful bacteria was carried out at 4, 0 or －5 ℃. It was found that the dominant harmful bacteria in thawed pork were Pseudomonas spp., Brochothrix thermosphacta, Enterbacteriaceae. Each harmful bacterium could grow at 4 or 0 ℃ of storage temperature. Further studies showed that Pseudomonas spp. and Brochothrix thermosphacta grew faster than others, with more colony forming units (CFU) observed. While most of the harmful bacteria grew slower at －5 ℃, and even decreased to some extent.

Key words: thawed pork, harmful bacteria, regrowth