In addition, S. suis was isolated from the surface of the dehairing table of slaughterhouse A and from 6 carcasses: 3 sampled atslaughterhouse B and 3 at slaughterhouse C.Among the 261 environmental swabs (of hands, knives, carcasses,scalding tanks, dehairing tables, and the floor of killing rooms),58 (22%) were positive for S. suis, on average, when PCR was donewithout culture, whereas only 16 (6%) yielded positive results whencultured. All samples from which S. suis was isolated were PCRpositive. Therefore, only 16 strains could be submitted for typingPCR and antimicrobial susceptibility testing. Of those, 8 (50%) wereuntypeable. Of the remaining 8 strains, the most frequent serotypeswere 4 and 29, each accounting for 12%, followed by 5, 12, 21, and 31,each accounting for 6%. However, serotypes 2 and 14, the serotypesmost commonly affecting humans, were not found