Gram-negative Enteric Bacteria — Previous-Year Questions
3 recall-based PYQs (NEET PG era). Regular mode with explanations.
A patient was suspected of having acute brucellosis. A serum sample was sent for a standard agglutination test. It came out to be negative initially, but after serial dilutions of the serum sample, the test turned out to be positive. Which of the following is responsible for the initial negative test?
AIncomplete antibodies
BComplement inactivation
CProzone phenomenon
DPost zone phenomenon