A 45-year-old otherwise healthy woman presents with fever, pleuritic chest pain and productive cough with rusty sputum for 2 days. She is tachycardic at 104 beats/min, temperature 38.5 °C, blood pressure 118/72 mmHg, oxygen saturation 95% on room air and respiratory rate 22 breaths/min. Chest X-ray shows right lower lobe consolidation. She has no significant comorbidities and CURB-65 score is 0. What is the most appropriate empiric antibiotic therapy in the community?