Prevalence of human pathogenic Yersinia enterocolitica in Swedish pig farms

Table 1 Phenotypic characterisation of Yersinia enterocolitica isolates obtained from diarrhoeic patients (n = 50) and finisher-pig farms (n = 32)

Origin	Farms (no.)/patients (no.)	Bioserotype	Colony colour on CAY		Bioserotype as determined by MALDI-TOF	Aesculin test
Origin	Farms (no.)/patients (no.)	Bioserotype	After 24 h	After 48 h	Bioserotype as determined by MALDI-TOF	Aesculin test
Porcine	31	4/O:3	White/mauve	Mauve	4/O:3	N/A
Porcine	1	2/O:9	White/mauve	Mauve	2/O:9	N/A
Human	12	O:3	White/mauve	Mauve	4/O:3	N/A
Human	9	1A	Blue	Blue opaque	N/A	N/A
Human	7	O:3	White	Mauve	4/O:3	N/A
Human	7	O:9	White/mauve	Mauve	2/O:9	N/A
Human	4	O:8	Blue	Blue opaque	Biotype 1A*	+
Human	4	O:21	Blue	Blue opaque	1A/O:21	N/A
Human	3	O:3	White	White	4/O:3	−
Human	2	O:8	White/poor growth	Mauve	Biotype 1B*	−
Human	2	O:5/27	White/mauve	Mauve	2/O:27	N/A

Bioserotypes for human strains were provided by the National Food Agency in Sweden
N/A, not available; +, positive; −, negative
* Aesculin test was used to differentiate between biotype 1A and 1B, if subtyping could not be obtained by MALDI-TOF alone

ISSN: 1751-0147