For diabetic ulcer foot infections what's good? Zosyn (piperacillin and tazobactam)?

Yes. Zosyn (piperacillin and tazobactam) is one of several antibiotics that is effective as empiric treatment for diabetic foot infections. Wound cultures guide definitive antibiotic treatment. You need to keep your diabetes under tight control to prevent development of peripheral vascular disease and neuropathy which predispose to serious diabetic foot infections and osteomyelitis.
Yes. Zosyn (piperacillin and tazobactam) is probably the most commonly used initial antibiotic, along with vancomycin for MRSA coverage. There are other antibiotics that can be used, and routinely these antibiotics are changed to something more specific once culture results can be accessed.
Diabetic wound infec. After many years of clinical experience, just about any bacteria can be found in a wound. Some are very common as with staphylococcus aureus; others can be very uncommon. The choice of antibiotics is made with a clinical examination, degree of infection, and culture results. It is too variable to provide a short answer.
Yes and no. Zosyn (piperacillin and tazobactam) is a very powerful antibiotic which is generally very effective for diabetic foot ulcer. One must however know which organism we are dealing with in order to determine the best choice of antibiotic. Antibiotic selection should be selected based on a culture and sensitivity.