ROSE BENGAL PLATE TEST (RBPT): The RBP-test is a rapid plate agglutination test. Used for diagnosis of bovine brucellosis. The antigen for RBPT is a dense (8%) suspension of inactivated Brucella-organisms stained with Rose Bengal and adjusted to pH 3.65. It is a screening test (qualitative) and positive cases should be confirmed with tube agglutination test