1. 1. Mclntosh, K., Leung, C.W. and Hon, E.K.L. (2009): Coronaviruses and toroviruses, including severe acute respiratory syndrome. p. 2531–2546. In Feigin & Cerry's Text Book of Pediatric Infectious Diseases. 6th ed.
2. 2. National Institute of Infectious Diseases and Tuberculosis and Infectious Diseases Control Division, Ministry of Health, Labour and Welfare: Infectious Agents Surveillance Report. Yearly Reports of Virus Isolation/Detection from Human Sources. Online at ⟨http://idsc.nih.go.jp/iasr/virus/virus-e.html⟩.
3. 3. Hirokawa, C., Watanabe, K., Kon, M., et al. (2008): Isolation of a virus closely related to human coronavirus 229E from a case of pharyngitis, March 2008–Niigata. Infect. Agents Surveillance Rep., 29, 283 (in Japanese).
4. 4. Gaunt, E.R., Hardie, A., Claas E.C.J., et al. (2010): Epidemiology and clinical presentations of the four human coronaviruses 229E, HKU1, NL63, and OC43 detected over 3 years using a novel multiplex real-time PCR method. J. Clin. Microbiol., 48, 2940–2947.
5. 5. Kaida, A., Kubo, H., Sekiguchi, J., et al. (2011): Experiment of multiplex real-time PCR for detection of various respiratory viruses, October 2009–September 2010–Osaka City. Infect. Agents Surveillance Rep., 32, 202–203 (in Japanese).