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.