68-1069. 37. Whitley. R. J.. and J. W. Gnanns 1993. The epidemiology and clinical man- ifestations of herpes simplex virus infections, p. 69-105. In B. Rottman, R.1. Whitley. and C. Lopez (ed.), The human hemesvirmes Raven Poss. New York. 38. Wilcox. C. M. D. A. Schwartz. and W. S. Clark. 1995. Esophageal