Analysis of S. Epidermidis icaA and icaD genes by polymerase chain reaction and slime production: a case control study

Table 1 Association between slime production on congo red agar and presence of icaA and icaD genes in the 82 S. epidermidis strains

Groups	n	Slime production						mecA vs icaD
		icaA		icaD		icaA+icaD		mecA vs icaD
		r	P value	r	P value	r	P value	r	P value
1	22	0.894	0.000^◇	0.459	0.036^△	1.000	0.000^◇	0.686	0.001^☆
2	21	0.679	0.001^◇	0.439	0.047^△	0.748	0.000^◇	0.553	0.009^☆
3	19	0.701	0.001^◇	0.406	0.085	0.782	0.000^◇	0.456	0.049^☆
4	20	0.533	0.015^△	0.408	0.074	0.698	0.001^◇	0.535	0.015^☆

Group 1, blood isolates obtained from patients’ IV line; Group 2, nasal isolates of healthy volunteers; Group 3, nasal isolates of the same patients in Group 1; Group 4, nasal isolates of ICU staff. ^△The correlation between the presence of the operon and the presence of slime production in all groups (p<0.05). ^◇The correlation between the presence of the operon and the presence of slime production in all groups (p<0.001). ^☆The correlation between the presence of MecA and icaD (p<0.05).