Effects of pollutants on the aquatic environment
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# 7.3 Faecal streptococci

The faecal streptococci group of bacteria consists of the species Streptococcus faecalis (Figure 9), S. faecium, S. durans, S. equinus and S. bovis. The bacteria are approximately 1 µm in diameter and occur in chains of varying length. They die fairly quickly outside their host, so their presence is indicative of recent pollution.

Figure 9 Streptococcus faecalis
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