| The weak beta-hemolysis of Group B Strep (Streptococcus agalactiae) synergistically combines with the beta hemolysis of a strain of Staph aureus to produce the arrow head shape of strong beta hemolysis that characterizes a positive CAMP test (named for the initials of the 4 discovers).
| Although the extent of beta hemolysis is less, Listeria monocytogenes also
produces a positive CAMP test (and the quality of the photo makes it even harder to see). On gram stain, Listeria is a gram-positive rod rather than Gram-positive cocci in chains like Group B Strep.
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