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

Affiliations

• ¹ Department of Clinical Oncology, Taihe Hospital, Hubei University of Medicine, Shiyan 442000, China.
• ² Shanghai Public Health Clinical Center, Fudan University, Shanghai 201508, China.
• ³ Department of Internal Medicine and Radboud Center for Infectious Diseases (RCI), Radboud University Nijmegen Medical Centre, 6526 GA Nijmegen, the Netherlands; Immunology and Metabolism, Life & Medical Sciences Institute, University of Bonn, Bonn 53115, Germany.
• ⁴ Department of Clinical Oncology, Taihe Hospital, Hubei University of Medicine, Shiyan 442000, China. Electronic address: luozhiguo@hbmu.edu.cn.
• ⁵ Affiliated Cancer Hospital & Institute of Guangzhou Medical University, State Key Laboratory of Respiratory Diseases, Guangzhou Medical University, Guangzhou 510095, China. Electronic address: qbleng@sibs.ac.cn.