Why would a doctor prescribe prednisone for when patient is fighting an infection?

Short term usage of steroids do not have a significant effect on the immune system. As noted below, it is appropriate for the inflamation of tonsillitis. The bacterial infection is treated with the Augment, an antibiotic. It does what your immune system has not been able to do with any great success.

"A peritonsillar abscess should be drained either by removal of fluid with a needle and syringe (needle aspiration), cutting open with a scalpel (incision), or tonsillectomy. Chronic stones in the tonsil can be removed with a clean finger or with a blunt probe. Massive enlargement of the tonsils and adenoids causing airway obstruction may be treated with a long course of antibiotics, or even a brief course of steroids to reduce inflammation (cortisone-related medications, such as prednisone and prednisolone)".

I am an RN.

Prednisone is a very complicated medication. Long term it can be immuno suppressive but in short term it's anti inflammatory. Tonsillitis causes swelling from inflammation which can be deadly in the throat area. It's often prescribed for issues like that. BE AWARE that steriods and antibiotics are two medications that HAVE TO BE TAKEN EXACTLY AS DIRECTED.

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Yes. Many doctors are incompetent sadly. I suggest you find another one. Did he give you an antibiotic?