Azithromycin is an antibiotic.  Zinc attacks virus structures in the body and Hydroxychloroquine is an anti-viral.  Looks like the Doctor is trying to prevent multiple lung infections spiraling a patient into critical. The most interesting thing is that this is likely a very cheap treatment with large supplies and easy manufacturing.  And it could be done as out patient where people are quarantined.  The antibiotic might be switched based on availability.  This could be the big breakthrough. But I'm going to bet he's scamming and sends patients to other hospitals and doctors.  But we'll see how it goes.