Serratia marcescens

I have been diagnosed with Serrratia Marcescen as a
result of my dermatologist sending a biopsy of a skin
eruption. He has prescribed ciprofloxacin hydrochloride to
treat this skin condition. The side effects are worrisome.

Reading the info online, there is no mention of skin
irritations. I do not have any urinary problems.

Questions: How does one contact this infection and
is there another less dangerous drug that will
kill this iinfection?