Lactic acid bacteria such as Streptococcus are obligate fermenters that can exist in an aerobic environment due to their use of catalase to mitigate the presence of oxygen.

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Lactic acid bacteria like Streptococcus are actually facultative anaerobes, meaning that they can survive in both aerobic and anaerobic conditions. While they do not require oxygen for their metabolism, they can utilize it if available. However, they do not have catalase to break down hydrogen peroxide, which can lead to oxidative stress in the presence of oxygen.

Lactic Acid Bacteria Such as Streptococcus Are Obligate Fermenters That