Karen are the maggots on an area below the vent or are they around the vent? They can go up inside the vent and do more damage, but if the area is under the vent, that would be easier to manage. You all seem to have many more possibilities for problems in Florida--stick tightfleas, worse...
In one of these links, Michael recommends Penicillin shots for infection. Baytril may be better since you have it. Many people use epsom salt baths, betadine, or Peroxide (1-2 times only) and some use screw worm spray which is permethrin. Here are some good links to read, and sorry about your...