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United States Department of Agriculture

Agricultural Research Service

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Image Number D2922-1

In this test for STEC serogroup O111 bacteria, the sample on the left tested positive, whereas the one on the right was negative. The red clumps that formed in the sample on the left indicate that the O111 bacteria have bound with the O111 antibody-coated latex beads on the card.


Photo by Peggy Greb.

640 pixels wide: (d2922-1.jpg)

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Last Modified: 8/13/2016
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