The sixth international symposium sponsored by the Henry Ford Hospital in Detroit was held in October, 1956. The title was "Hepatitis Frontiers." The full text of the papers and the discussions following them will be published in book form.1 This is a brief summary of some of the topics discussed.It is now thought, although not by all workers in this field, that two forms of viral hepatitis, infectious hepatitis and serum hepatitis, are caused by different viruses. It has been reported that the incubation period of infectious hepatitis is 15 to 40 days and of serum hepatitis, 60 to 160 days.2 The virus that is thought to cause infectious hepatitis is referred to as virus A (I. H.) and the virus thought to cause serum hepatitis is referred to as virus B (S. H. ). According to W. P. Havens Jr.,1 Jefferson Medical College, Philadelphia, it
RESEARCH REVIEWS. JAMA. 1957;164(3):359–360. doi:10.1001/jama.1957.02980030135042
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