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Not all the action in your beer happens while the yeast is doing its job: some bacteria manage to survive and, if they succeed, they can change the flavor that the brewers worked so hard to achieve. Although beer is usually quite stable thanks to alcohol, bitter compounds in hops, and low levels of oxygen and nutrients, not all microorganisms give up. Some manage to grow and cause cloudiness, alter acidity, or even generate unwanted substances. Among these unexpected visitors, lactic acid bacter …