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Researcher conducts a antibiotic sensitivity test
Antibiotic sensitivity test. Researcher tests the sensitivity of bacteria to antibiotics in a petri dish. Small portions (white circles) of different antibiotics have been deposited on the surface of blood agar (red) which was covered with bacterial colonies. The technician is examining the colonies to see how effective the antibiotics have been at killing them. The result of a test like this is typically used to determine which is the most suitable antibiotic to treat the bacterial infection under examination. Blood agar has blood cells suspended in the agar gel, and is used as a nutrient medium for the bacteria.
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