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Infection
Infection is the name for a storage or production-derived fault that can cause aromas of flavors of rubber, plastic, sourness, vinegar, movie popcorn butter or butterscotch. It often affects the carbonation of beer in a noticeable way giving it a different, higher-treble bubbling sound. This flaw is derived from the undesirable presence of microorganisms. (Wine,Beer,Spirits,Sake,Mead/Tasting Terms Chemistry & Flaws)