1. A. Isaacs and J. Lindenmann Proc. Roy.
2. A unit of interferon is generally defined as Soc. London. Ser. B 147 , 258 ( 1957 ). the reciprocal of the highest dilution of a sample that protects the cells against viral attack.
3. T. C. Merigan in The Interferons G. Rita Ed. (Academic Press London 1968).
4. Scientific Committee on Interferon Lancet
5. V. D. Solov'ev , Bull. World Health Org. 41 , 1962 - 1961 , 873 (1962). 683 (1969).