The pain you describe sounds very much like pain of the chest wall that includes the ribs, muscles, cartilage, intercostal ligaments and nerves. That is it does not sound like pain from the pleura, lung or any of the underlying organs.
The new class of drugs was known as beta-lactamase inhibitors and they worked to block the ability of the S. aureus bacteria to destroy the distinctive penicillin ring structure. The new combination drugs that are effective against Staphylococcus aureus infections are amoxicillin/clauvulante, ampicillin/sublactam, piperacillin/tazobactam and ticarcillin/clavulanate.
What is methicillin-resistant staphylococcus aureus (MRSA)? Methicillin-resistant staphylococcus aureus is a bacterial infection resistant to antibiotic methicillin. Staphylococcus aureus, sometimes referred to simply as staph, or staph A is a common bacterium found on the skin of healthy people. If staph gets into the body it can cause a minor infection such as boils or pimples or serious infections such as pneumonia or blood infections.