बे भाइरेलनि सायाव खनले खनले उफेरा फाहामथाय खालामनायखौ लानानै भरताव जि बोसोर बैसो सिगांनि बांसिनफ्राम गथ'फोरनियाव इमुनिटि जौगायो ।
almost all the children in India develop immunity following sub clinical repeated exposure to this virus before 10 years of age .