Original: The III-S strain covers itself with a polysaccharide capsule that protects it from the host 's immune system , resulting in the death of the host , while the II-R strain does n't have that protective capsule and is defeated by the host 's immune system .
Simplified: The III-S strain covers itself with a polysaccharide capsule that protects it from the host 's immune system . The II-R strain does not have that protective shield around it and is killed by the host 's immune system .