Streptococcus sp. Lecture content. Basic characteristics Classification Grouping of species Pathogenesis Lab diagnosis. Scientific classification. Kingdom – Bacteria Phylum - Firmicutes Class – Bacili Order – Lactobacillales Family – Streptococcaceae Genus - Streptococcus
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Colonies surrounded with a zone complete of haemolysis (decolorize of hemoglobin)
More marked when incubate anaerobically
S.pyogenes (Group A)
From the implication of pathogenesis, it will leads to a serious stage of diseases:
By S. pyogenes
Enterococci (Group D)
Phylum: FirmicutesClass: BacilliOrder: LactobacillalesFamily: LactobacillaceaeGenus: Lactobacillus
They are common and usually benign. In humans they are present in the vagina and the gastrointestinal tract, where they are symbiotic and make up a small portion of the gut flora.
Explain what happens in the following biochemical tests:
i) Indole test
ii) Methyl red test
b) Write the scientific name of a bacterium that gave positive results for both tests.
State all group of gram positive and gram negative bacteria.