बिनिखायनो मोदोमगरलै बिमाया होबथाजायो आरो बिमा निफ्राय भ्रनाव रैखाथि थानदैफोरा दलरै ओंखारलाङो, बेनि दारै बेखौ रैखाथि होयो।
So the pregnant mother is immunized and the protective agents passively pass from the mother to the foetus, thereby protecting it.