Neither Acetobacter aceti nor S. cerevisiae have been reported as a human pathogen. Although very rare, S. cerevisiae are capable of causing human disease in opportunistic circumstances, particularly in immunosuppressed or critically ill patients. _A. aceti _has been shown to cause some detrimental effects on pineapples. The pink disease in pineapples causes the fruit to turn a slight pink colour, only to eventually become brown and then rot.