Have a look at this agar plate below and answer the questions: (for bacteriologists only)

1) What is this test called and why?

2) Given that the horizontal streak is Staphylococcus aureus, what organism is likely to be represented by the “arrow” pointing towards it?

3) What other bacterium can cause a similar phenomenen?

4) How useful is this test likely to be in the future?

Click here for the answers with brief explanations