Microbiology Which of the following denote classical complement pathway activation in immune-inflammatory conditions: September 2012 A C2, C3 and C4 decreased B C2 and C4 is normal; C3 is decreased C C3 normal; C2 and C4 decreased D C1 and C3 normal; C2 is increased 💡 Explanation Which of the following denote classical complement pathway activation in immune-inflammatory conditions: September 2012 ✓ Correct Answer: A. C2, C3 and C4 decreased