Strong immunity against COVID-19 in the early two years of age links to frequent immunization of routine vaccines

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1. Hubei Provincial Department of Science and Technology Innovation Group Programme [2019CFA034]
2. Foundation for Free Exploration of Hubei University of Medicine [FDFR201802]
3. Shiyan Municipal Guided Emergent Scientific Research Programme for the Prevention and Control of New Coronavirus Pneumonia [20Y12]
4. National Natural Science Foundation of China [81972668]
5. National Key Research and Development Program of China [2018ZX10301-208]