Report the zones of inhibition for each organism and antibiotic; determine wheth
ID: 267150 • Letter: R
Question
Report the zones of inhibition for each organism and antibiotic; determine whether the organism is resistant, intermediate or susceptible.
Organism 1
Organism 2
Organism 3
Organism 4
Stapj
E. coli
Bacillus
X
AB
Zone Dia.
S, R, I?
Zone Dia.
S, R, I?
Zone Dia.
S, R, I?
Zone Dia.
S, R, I?
Ampicillin
28
26
45
Gentamicin
30
21
32
Chloramphenicol
35
32
38
Ciprofloxacin
37
35
37
Organism 1
Organism 2
Organism 3
Organism 4
Stapj
E. coli
Bacillus
X
AB
Zone Dia.
S, R, I?
Zone Dia.
S, R, I?
Zone Dia.
S, R, I?
Zone Dia.
S, R, I?
Ampicillin
28
26
45
Gentamicin
30
21
32
Chloramphenicol
35
32
38
Ciprofloxacin
37
35
37
Explanation / Answer
Zone of inhibition occurs due to action of antibiotic on bacterial growth, when antibiotic disc placed on spreaded plate thsi diffuse in the medium inhibits and form the clear zines is called inhibitory zones and concentration is called minimum inhibitory concentration MIC and dose of drug called LD lethal dose.
If no zones are obtained that means organism is resistant to that antibiotic which means bacterial culture even in antibiotic pressure. The organism 4, X is resistant.
If zones are bigger that drug is more effective broad range, hence organism is more susceptible.
If the zones are not so bigger but not even absent they are called moderate or intermediate susceptable.
From the above data organism 3 is more suscpetable.
Organism 4 , is resistant
Organism 1, 2 are moderately suscpetable so the zones are not bigger than 3 organism.