Effectiveness of Trivalent Inactivated Influenza Vaccine in Children Estimated by a Test-Negative Case-Control Design Study Based on Influenza Rapid Diagnostic Test Results Masayoshi Shinjoh , Contributed equally to this work with: Masayoshi Shinjoh, Norio Sugaya Affiliations Department of Pediatrics, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan, Center for Infectious Diseases and