1. Use of 13-valent pneumococcal conjugate vaccine and 23-valent pneumococcal polysaccharide vaccine among adults aged ≥65 years: recommendations of the Advisory Committee on Immunization Practices (ACIP);S Tomczyk;MMWR Morb Mortal Wkly Rep,2014
2. Infectious agents surveillance report (IASR) [Haienkyukin kansensyou 2013 nen genzai]. 2013;34:55–6. Japanese.
3. Watanabe. Relationship between public subsidies and vaccination rates with the 23-valent pneumococcal vaccine in elderly persons, including the influence of the free vaccination campaign after the Great East Japan Earthquake;T Naito;J Infect Chemother,2014
4. Ministry of Health, Labour and Welfare. Infectious Pneumococcal Disease (among elderly). Japanese. Available from: http://www.mhlw.go.jp/stf/seisakunitsuite/bunya/kenkou_iryou/kenkou/kekkaku-kansenshou/haienkyukin/index_1.html
5. Publicly-funded influenza and pneumococcal immunization programs in Canada: a progress report;SG Squires;Can Commun Dis Rep,2000