Figure 4.

Antimicrobial activity of U. barbata preparations. (A) Size of the inhibition zone of the sunflower-oil U. barbata extract and its zinc salt on Gram-positive and Gram-negative reference strains; (B) In vitro effect of the salt on S. aureus (n = 10), Salmonella spp (n = 5), E. coli (n = 10), and E. faecalis (n = 10) strains isolated from chickens. Not effective (very small inhibition zone) ≤8 mm, low effective (small inhibition zone) = 8–13, moderately effective (medium inhibition zone) = 14–19 mm, and highly effective (large inhibition zone) ≥20 mm. Sunflower oil was used as negative control and did not cause a zone of inhibition.