差分

**the reasonis considered because of interaction between B polysaccharide and fetal brain tissue, resulting in possible immunotolerance*polysaccharide of **interaction is observed as antibodies against B has potential toxicity for infant -PS have also affinity to fetal braintissue**it means B-PS of B shows interaction with fatal brain cells which suggests vaccine has potential of causing neurological damage for young infants*currently available men B vaccines are protein-based vaccine, not PS vaccine**proteins expressed on the surface of ''N. meningitidis'' group B are purified through bacterial culture