Pathogenic Streptococcus pneumoniae possess a polysaccharide…

Pathogenic Streptococcus pneumoniae possess a polysaccharide capsule that prevents phagocytosis, allowing them to evade the immune system and multiple, causing pneumonia. S. pneumoniae that lack the capsule do not cause disease as they are readily destroyed by host phagocytes. When a mixture of living nonencapsulated and heat-killed encapsulated S. pneumoniae are injected into a mouse, the mouse dies, and living capsulated bacteria can subsequently be isolated from the mouse. Which of the following best explains this result?