Help with evaluating disk diffusion antibiotic sensitivity test

[fmichael1]

HI, I got question for my homework and it goes like this.

 

i got a culture of s.aureus that been incubated with AB disks and that's what came out:

1. benzilpenicilin 10mm [13-19] - resistant

2. vancomycin 14mm [11-12] - sensitive

3. ciprofloxacin 23mm [15-21] - sensitive

 

now, the culture showed sensitivity for the 2nd and the 3rd AB but both of them are +2mm.

so which one of those should i chose and what are the parameters that i should evaluate?

 

thanks!

[CharonY]

The description is not clear to me. What does the 10, 14, 23 mm refer to? The inhibition zone? Or do you mean that 2mm is the zone of inhibition, how does it look for 1?

What do the number in brackets refer to?

 

Also I do know what you mean with chosing? The goal is to establish which ABs they are sensitive to, no?