Volume 74, no. 5, p. 2481–2487, 2000. Page 2481: The list of authors and their affiliations should appear as shown above.
Page 2483, Fig. 1B: amino acids 721 to 726 should be deleted from plasmid construct G/gB3/G.
Page 2485, lines 1 and 2 of the Acknowledgments: Delete the acknowledgment of Hara P. Ghosh.
Page 2486, column 1, line 4: Add “and the Medical Research Council of Canada (H.P.G.).”