Medium-sized colonies that appear buff in colour on Blood Agar. The bacteria produce a red pigment which is easily seen when grown on blood-free media such as nutrient agar or Kings agar B. This culture has been incubated at 30°C.
The picture below shows Serratia marcescens on a Plate Count Agar.
Click on the picture to see an enlarged version. |
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The same Blood Agar plate examined with transmitted light. In areas of confluent growth an unspecific lysis of the blood cells due to enzymatic activity is seen.
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