FIG. 5.

Kirby-Bauer test assessing zone of inhibition of bacterial growth by gentamicin (“Gent”), compounds of interest (“Cmpd”), including vitamin C, vitamin E, magnesium, and combinations of these three agents alone (CEMg) or with the addition of β-carotene (ACEMg), the compound of interest plus gentamicin (“Cmpd+Gent”), and a control (“Ctrl”) with no agent added to the disk. The diagram at the bottom of each panel indicated the placement of each condition within the bacterial test dishes; the order was reversed for H. influenzae (B, E, H, K, N, and Q), relative to P. aeruginosa (A, D, G, J, M, and P) and S. aureus (C, F, I, L, O, and R).