Multiple choice

Extracellular bacteria such as Streptococcus pyogenes infecting the humans are optimally killed by

  1. macrophages

  2. complement

  3. antibody

  4. macrophages plus complement

  5. macrophages plus antibody plus complement

Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Bacteria opsonized by IgG and C3b will adhere and activate both macrophages and neutrophils for phagocytosis and killing.