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How many systems does the complement fixation reaction include?

  • A.2 systems
  • B.4 systems 
  • C.3 systems
  • D.5 systems

Answer: A

Correct answer: 2 systems

The test uses two systems. The first is antigen, antibody and complement; if they match, the complement is consumed. The second - the haemolytic indicator system of sheep red cells and haemolysin - is then added to reveal whether any complement is left.

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