Nabriva Therapeutics plc has gained FDA approval of NDAs for both I.V. and oral formulations of lefamulin, a semisynthetic antibiotic for the treatment of community-acquired bacterial pneumonia (CABP) it will market as Xenleta. It's the first pleuromutilin for systemic use in humans to win FDA approval, leading the first new class of antibiotics for CABP in almost 20 years.