superbug
From Longman Dictionary of Contemporary EnglishRelated topics: Illness & disability, Microbes, genetics, biochemsuperbugsu‧per‧bug /ˈsuːpəbʌɡ $ -ər-/ noun [countable] MIHBMa type of bacteria that cannot be killed by traditional drugsExamples from the Corpussuperbug• The tots were struck down by a superbug in the intensive care unit at the London hospital.