Table 1.

Breakpoints (mg/L) of delafloxacin for organisms causing acute bacterial skin and skin structure infections (ABSSSI)

PathogenFDAa
EUCAST (EMA)b
ScIRSR
Staphylococcus aureusd≤0.250.5≥1≤0.25>0.25
Staphylococcus haemolyticus≤0.250.5≥1
Staphylococcus lugdunensis≤0.03ee
Streptococcus groups A, B, C and G≤0.03>0.03
Streptococcus pyogenes≤0.03ee
Streptococcus agalactiae≤0.060.12≥0.25
Streptococcus anginosus groupf≤0.06ee≤0.03>0.03
Enterococcus spp.IEgIE
Enterococcus faecalis≤0.120.25≥0.5
Viridans group≤0.03>0.03
Enterobacteralesh,i≤0.250.5≥1≤0.125>0.125
Pseudomonas aeruginosa≤0.51≥2IEIE
PathogenFDAa
EUCAST (EMA)b
ScIRSR
Staphylococcus aureusd≤0.250.5≥1≤0.25>0.25
Staphylococcus haemolyticus≤0.250.5≥1
Staphylococcus lugdunensis≤0.03ee
Streptococcus groups A, B, C and G≤0.03>0.03
Streptococcus pyogenes≤0.03ee
Streptococcus agalactiae≤0.060.12≥0.25
Streptococcus anginosus groupf≤0.06ee≤0.03>0.03
Enterococcus spp.IEgIE
Enterococcus faecalis≤0.120.25≥0.5
Viridans group≤0.03>0.03
Enterobacteralesh,i≤0.250.5≥1≤0.125>0.125
Pseudomonas aeruginosa≤0.51≥2IEIE
a

US FDA Recognized Antimicrobial Susceptibility Test Interpretive Criteria.

b

EUCAST [acting under Standard Operating Procedures (SOP) for the EMA].

c

S, susceptible; I, intermediate; R, resistant [FDA and EUCAST; see detailed definition in (i) Document M100 (Performance Standards for Antimicrobial Susceptibility Testing) of the CLSI for the FDA and (ii) EUCAST documentation (EUCAST; no I category set for delafloxacin essentially because the approved dosage is fixed)].

d

Methicillin-resistant and methicillin-susceptible isolates.

e

For the FDA, the current absence of resistant isolates precludes defining any results other than ‘Susceptible’. Isolates yielding MIC results other than ‘Susceptible’ should be submitted to a reference laboratory for further testing.

f

For FDA: this includes S. anginosus, S. constellatus and S. intermedius.

g

IE (EUCAST): insufficient evidence that the organism or group is a good target for therapy with the agent.

h

New nomenclature for Enterobacteriaceae.

i

For FDA: E. coli, K. pneumoniae, and E. cloacae only; for EUCAST: E coli only.

Table 1.

Breakpoints (mg/L) of delafloxacin for organisms causing acute bacterial skin and skin structure infections (ABSSSI)

PathogenFDAa
EUCAST (EMA)b
ScIRSR
Staphylococcus aureusd≤0.250.5≥1≤0.25>0.25
Staphylococcus haemolyticus≤0.250.5≥1
Staphylococcus lugdunensis≤0.03ee
Streptococcus groups A, B, C and G≤0.03>0.03
Streptococcus pyogenes≤0.03ee
Streptococcus agalactiae≤0.060.12≥0.25
Streptococcus anginosus groupf≤0.06ee≤0.03>0.03
Enterococcus spp.IEgIE
Enterococcus faecalis≤0.120.25≥0.5
Viridans group≤0.03>0.03
Enterobacteralesh,i≤0.250.5≥1≤0.125>0.125
Pseudomonas aeruginosa≤0.51≥2IEIE
PathogenFDAa
EUCAST (EMA)b
ScIRSR
Staphylococcus aureusd≤0.250.5≥1≤0.25>0.25
Staphylococcus haemolyticus≤0.250.5≥1
Staphylococcus lugdunensis≤0.03ee
Streptococcus groups A, B, C and G≤0.03>0.03
Streptococcus pyogenes≤0.03ee
Streptococcus agalactiae≤0.060.12≥0.25
Streptococcus anginosus groupf≤0.06ee≤0.03>0.03
Enterococcus spp.IEgIE
Enterococcus faecalis≤0.120.25≥0.5
Viridans group≤0.03>0.03
Enterobacteralesh,i≤0.250.5≥1≤0.125>0.125
Pseudomonas aeruginosa≤0.51≥2IEIE
a

US FDA Recognized Antimicrobial Susceptibility Test Interpretive Criteria.

b

EUCAST [acting under Standard Operating Procedures (SOP) for the EMA].

c

S, susceptible; I, intermediate; R, resistant [FDA and EUCAST; see detailed definition in (i) Document M100 (Performance Standards for Antimicrobial Susceptibility Testing) of the CLSI for the FDA and (ii) EUCAST documentation (EUCAST; no I category set for delafloxacin essentially because the approved dosage is fixed)].

d

Methicillin-resistant and methicillin-susceptible isolates.

e

For the FDA, the current absence of resistant isolates precludes defining any results other than ‘Susceptible’. Isolates yielding MIC results other than ‘Susceptible’ should be submitted to a reference laboratory for further testing.

f

For FDA: this includes S. anginosus, S. constellatus and S. intermedius.

g

IE (EUCAST): insufficient evidence that the organism or group is a good target for therapy with the agent.

h

New nomenclature for Enterobacteriaceae.

i

For FDA: E. coli, K. pneumoniae, and E. cloacae only; for EUCAST: E coli only.

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