Figure 4.

Biofilm formation by isolates HU-85a and HU-85c. S. aureus strain SA113 was included as reference. Each bar represents the arithmetic media ± SEM from 4 to 6 wells from 3 independent experiments. Biofilm formation values correspond to the optical density at 595 nm of crystal violet (OD_B) measured relative to the final culture density of the bacterial growth (OD_G) after 24 h incubation. The increase in biofilm formation by isolate HU-85c compared with HU-85a was significant (Student t-test).