Fig. 1.

PCR detection of the icaA and icaD genes in SA and SE isolates. Lane 1, absence of amplification product from a strong SE biofilm producer (31 III SE); Lane 2, icaA-positive, strong SE biofilm producer (21 SE); Lane 3, icaD-positive, strong SE biofilm producer (21 SE); Lane 4, icaA-positive, weak SA biofilm producer (40 SE); Lane 5, icaD-positive, weak SA biofilm producer (40 SE); Lanes 6–7, icaA- and icaD-negative (respectively) strong SA biofilm producer (54 SA); Lane 8, icaD-positive, weak SA biofilm producer (25 SA); Lanes 9–10, icaA- and icaD-negative (respectively) weak SE biofilm producer (42 SE); Lane 11, icaA-positive, weak SE biofilm producer (13 SE);