1) Larson, H. E., Price, A. B., Honour, P. & Borriello, S.P.: Clostridium difficile and the aetiology of pseudomembraneous colitis. Lancet, 1: 1063-1066, 1978.
2) Bartlett, J. G., Chang, T. W., Gurwith, M., Gorbach, S. L. & Onderdonk, A. B.: Antibioticassociated pseudomembranous colitis due to toxin-producing clostridia. N. Engl. J. Med., 298: 531-534, 1978.
3) George, R. H., Symonds, J. M., Dimock, F., Brown, J. D., Arabi, Y., Shinagawa, N., Keighley, M. R. B., Alexander-Williams, J. & Burdon, D. W.: Identification of Clostridium difficile as a cause of pseudomembraneous colitis. Br. Med. J., 1: 695, 1978.
4) George, W. L., Rolfe, R. D., Harding, G. K. M., Klein, R., Putnam, C. W. & Finegold, S. M.: Clostridium difficile and cytotoxin in feces of patients with antimicrobial agent-associated pseudomembraneous colitis. Infection, 10: 205-208, 1982.
5) George, W. L., Sutter, V. L., Citron, D. & Finegold, S. M.: Selective and differential medium for isolation of Clostridium difficile. J. Clin. Microbiol., 9: 214-219, 1979.