Biofilm Formation among Clinical and Food Isolates of Listeria monocytogenes

Table 1

Classification of food and clinical isolates belonging to different serogroups isolates concerning their ability to form biofilm during five days at 4°C and 24 hours at 37°C (results are expressed as % of isolates).

Serogroup	NF-C	NF-F	WF-C	WF-F	MF-C	MF-F	SF-C	SF-F
	4°C/5 days
IIa	8	16	92	72	0	12	0	0
IIb	48	24	52	62	0	14	0	0
IIc	—	20	—	71	—	9	—
IVb	44	28	56	63	0	9	0	0
	37°C/24 hours
IIa	0	0	8	50	92	48	0	1
IIb	0	0	38	57	43	40	19	3
IIc	—	2	—	66	—	30	—	2
IVb	0	2	87	81	12	17	1	0

NF-C: non formers of clinical origin; NF-F: non formers of food origin; WF-C: weak formers of clinical origin; WF-F: weak formers of food origin; MF-C: moderate formers of clinical origin; MF-F: moderate formers of food origin; SF-C: strong formers of clinical origin; SF-F: strong formers of food origin.