Ball python death

Question
I have three snakes all with what I think is a respitory infection. At the first sign I took all three to the vet and they were put on zosyn injections. One every night 14 doses. This was 12 days ago. Last Wednesday my male died after already getting 7 injections. His color looked like he was going into sheed since I had taken his to the vet a week before. Now one of my females is looking worse after almost two weeks of injections and her color is fading like she is going into shed. I don't know what to do. Is her color fading a sign that she is dying. I don't want to loose another snake. The first one was devastating but I don't know what to do

Answer
Richard,  Zosyn is a pretty strong one. It sounds like it is not the right one. I would take them back for a culture fast. Metronidazole or flagyl and amoxicillan is more often used. Without the culture they will not know which to use because they won't know exactly what bacteria it is they are dealing with. Please keep me updated. Good Luck, Tina