Abstract
The presence in water supplies of aerobic spore-bearing bacilli which ferment lactose has been reported several times. It is now recognized that these types may cause some confusion in interpreting results in the standard lactose broth, especially when examining treated waters. The confusion caused by anaerobic lactose fermenters, such as the Welch bacillus and its allies, has been well recognized for a considerable time, but the recognition of aerobic forms which may also give rise to misleading presumptive tests has been more recent.
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