In vitro hollow fiber infection model (HFIM) with N. gonorrhoeae strains WHO-F and WHO-X; no animal infection studies
“Dose ranging and dose fractionation studies in HFIM showed that single doses ranging from 2 g to 8 g successfully eradicated N. gonorrhoeae reference strains WHO-F and WHO-X.”
N. gonorrhoeae is a human-specific pathogen; animal infection models are unreliable
“Neisseria gonorrhoeae is a human specific pathogen that grows poorly in nonhumans. As such, animal models (mouse, rabbit, guinea pig, hamster, chimpanzees etc.) are unreliable models of N. gonorrhoeae infection.”
FDA considered dosage supported by phase 2 data and by PTA analyses based on the nonclinical (HFIM) PK-PD target
“Additionally, the proposed dosage was supported by the safety and efficacy data from the phase 2 trial (DMID 14-0014) as well as the PTA analyses based on the nonclinical PK-PD target.”