Streptococci, faecal

This problem may be solved by examining the water for faecal streptococci. Faecal streptococci survive longer in water than E. coli, and are more resistant to 

Faecal streptococci are Gram-positive cocci usually growing in short chains and producing small colonies when grown aerobically. They grow in the presence of sodium azide and bile salts. Azide inhibits organisms containing a cytochrome 

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DICKSON, P H and TRIBE, H T. (1984). A note on the fate of salmonellae, presumptive coliforms and faecal streptococci in raw sewage sludge buried in soils. Unpublished. 

The importance of microbiological indicators varies. The most important is the determination of microbes from the Enterobacteriaceae family and faecal streptococci. 

Presumptive positives are indicated by growth at 35 °C on Azide Dextrose broth, which also allows the organisms to be counted. The production of red colonies on Slanetz and Bartley s medium at 44 °C is also indicative of faecal streptococci, and this medium is frequently used in membrane filtration systems. These media may be in either the solid or liquid form, but solid media cannot be remelted once prepared. Azide is toxic and the manufacturer s advice for the preparation of these media should be followed. It may also become explosive in the presence of certain metals and should be disposed of carefully. Azide can be destroyed safely by treatment with excess sodium nitrite. 

The presumptive faecal streptococci can be confirmed by subculture onto a plate of Bile Aesculin Azide Agar. This contains the water soluble glycoside aesculin, which is hydrolysed by S.faecalis and other Lancefield Group D strepto-... 

The germs generally used to indicate faecal contamination in water are Escherichia coli, faecal streptococci and sulphite-reducing, anaerobic,... 

For mineral water in Europe, there must be no Escherichia coli in 230 ml.) Faecal streptococci... 

Faecal streptococci must not be detectable in 100 ml of drinking water or 230 ml of mineral water. 

Faecal streptococci are able to grow in the presence of sodium azide (NaN3), while many other types of bacteria are inhibited or killed by azide. Thus, by using culture mediums containing azide, it is possible to... 

Faecal streptococci are gram-positive oval to lance-shaped diplococci or short-chain streptococci. 

Faecal streptococci must grow both in a nutrient broth whose pH has been set to 9.6, as well as in a nutrient broth which contains 6.3 % common salt (normal nutrient groth contains 0.3 % common salt). Incubation... 

Sheet - Detection of faecal streptococci Pseudomonas aeruginosa and sulphite-reducing Clostridia... 

Culture media used for identification Faecal streptococci ... 

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