There is this pink colony on Macvonkey agar, that has transperant see through zones of clearance. Previously this colony formed metalic colonies on m endo les However, i highly do not suspect E. Coli.
Lactose-fermenting bacteria with through zones of clearance might include :
- Escherichia coli (E. coli) : Some strains of E. coli are lactose fermenters and can also produce hemolysins, causing clear zones (beta-hemolysis) around the colonies.
- Klebsiella pneumoniae : A lactose fermenter that may sometimes show hemolysis in certain conditions.
- Enterobacter species : Another lactose fermenter that could show similar growth characteristics.
For confirm the identity of the bacteria and whether it's truly an issue of contamination or not, further testing would be required, such as : Gram staining, Oxidase testing, Biochemical testing.
Agree - could be an Enterobacter. Klebsiella usually produces a more mucoid colony.
Nicolas - hemolysis refers to lysis of blood cells. It is not a species-specific characteristic among coliform. In any case, MacConkey is not a blood agar.
The zones are not hemolysis. consist of precipitated bile salts.
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