Wiktionary
multiresistant
a. (context medicine English) resistant to multiple drugs (especially to multiple antibiotics)
Usage examples of "multiresistant".
In fact in the whole of Los Angeles County there are only around one hundred cases of multiresistant infections, and a large percentage of those are TB.
It may be that your patient's clostridium will respond to another antibiotic and is not actually multiresistant at all.