1. Dingle, J. H., McCorkle, L. P., Badger, G. F., Curtiss, C., Hodges, R. G., and Jordan, W. S., Am. J. Hyg., 64, 368 (1056).
2. Blacklow, N. R., Dolin, R., Fedson, D. S., DuPont, H., Northrup, R. S., Hornick, R. B., and Chanock, R. M., Ann. intern. Med., 76, 993 (1972).
3. Bocci, V., Russi-Sorce, M., Cirri, G., Rita, G., and Cantagalli, P., in The Interferons (edit. by Rita, G.), 37 (Academic Press, New York, 1968).
4. Dolin, R., Blacklow, N. R., Malmgren, R. A., and Chanock, R. M., J. infect. Dis., 122, 227 (1970).
5. Cantell, K., in Symposia Series in Immunobiological Standardization, International Symposium on Interferon and Interferon Inducers (edit. by Perkins, F., and Regamey, R.), 14, 6 (Karger, Basel, 1970).