Template:POTD protected/2008-05-17

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Agar plate

Red blood cells on an agar plate are used to diagnose infection. The plate on the left shows a positive Staphylococcus infection. The plate on the right shows a positive Streptococcus infection and with the halo effect shows specifically a beta-hemolytic group A. These infections can occur in patients undergoing chemotherapy.

Bill Branson, National Cancer Institute