Spot CAMP test for the prompt presumptive identification of group B streptococci

Spot and conventional CAMP tests done on 200 strains (120 human and 80 bovine) of group B streptococci showed 96 per cent of human and 90 per cent of bovine strains positive by both tests, indicating 100 per cent agreement. None of the 20 non-group B streptococci strains was positive for CAMP test for group B streptococci. The advantage of spot CAMP test is that it can be performed on a single isolated colony, easy to perform, inexpensive and can presumptively identify group-B streptococci within 30 min on primary sheep blood agar plate.