गावसोरनि रैखाथिगोनां बिफावआव जाफुंसारनो , टिकाफोरखौ बैसोनि सिगांआव होनांगोन जेब्ला सनदेरथिया गावनोगाव नुजानो हागौ ।
To be successful in their protective role vaccines should be given before the age when the infection itself is likely to occur .