Biofilm Formation and Adherence Characteristics of Listeria ivanovii Strains Isolated from Ready-to-Eat Foods in Alice, South Africa

Table 3

Coaggregation indices of selected biofilm forming Listeria ivanovii isolates with seven different reference strains partners.

Isolate (biofilm phenotype)	% Autoagg.	Coaggregation indices (%)
		Partner strains
		Range %	S. aureus	S. pyogenes A	S. Typhimurium	P. aeruginosa	P. shigelloides	A. hydrophila	S. sonnei
			NCTC 6571	ATCC 49399	ATCC 13311	ATCC 15442	ATCC 51903	ATCC 35654	ATCC 29930
Liv 188-2 (NA)	19	18–37	31	28	18	37	24	27	19
Liv 119-2 (NA)	20	13–40	25	22	13	40	16	25	28
Liv 194-2 (NA)	11	12–28	19	12	17	28	13	20	16
Liv 37-1 (WA)	42	53–74	67	68	74	67	53	67	70
Liv 18-1 (WA)	30	37–70	54	51	45	37	70	40	66
Liv 01-2 (WA)	46	67–75	68	70	72	71	72	67	75
Liv 03-2 (MA)	41	61–71	74	67	71	61	64	68	71
Liv 155-1 (MA)	35	57–70	57	62	60	58	58	66	70
Liv 99-2 (MA)	36	44–77	51	55	52	53	77	44	60
Liv 16-2 (SA)	47	41–67	67	66	61	41	53	62	56
Liv 38-1 (SA)	32	65–77	72	73	77	69	71	65	72
Liv 41-1 (SA)	55	49–69	61	59	67	49	66	57	69
C. indices > 50%		50–75	75	75	67	50	75	58	75

NA: non adherent; WA: weak adherent; MA: moderate adherent; SA: strong adherent; Autoagg.: autoaggregation; C. indices: coaggregation indices > 50%.