1. 1. National Institute of Infectious Diseases and Tuberculosis and Infectious Diseases Control Division, Ministry of Health, Labour and Welfare, Japan. Meningococcal infection, 2005-October 2013, Japan. Infect Agents Surveillance Rep. 2013;34:361'-2'.
2. 2. National Institute of Infectious Diseases and Tuberculosis and Infectious Diseases Control Division, Ministry of Health, Labour and Welfare, Japan. Trends in invasive meningococcal disease, week 13, 2013 to week 52, 2014, Japan. Infectious Agents Surveillance Report. 2015;36:179-81. Japanese.
3. 3. Harrison LH. Prospects for vaccine prevention of meningococcal infection. Clin Microbiol Rev. 2006;19:142-64.
4. 4. Keyserling H, Papa T, Koranyi K, et al. Safety, immunogenicity, and immune memory of a novel meningococcal (groups A, C, Y, and W-135) polysaccharide diphtheria toxoid conjugate vaccine (MCV-4) in healthy adolescents. Arch Pediatr Adolesc Med. 2005;159:907-13.
5. 5. Pichichero M, Papa T, Blatter M, et al. Immune memory in children previously vaccinated with an experimental quadrivalent meningococcal polysaccharide diphtheria toxoid conjugate vaccine. Pediatr Infect Dis J. 2006;25:995-1000.