Dose-Related Effects of Smallpox Vaccine

doi:10.1056/NEJMoa013431

Published at www.nejm.org March 28, 2002 (10.1056/NEJMoa013431)

Dose-Related Effects of Smallpox Vaccine

Sharon E. Frey, M.D., Frances K. Newman, M.S., John Cruz, W. Brian Shelton, Ph.D., Janice M. Tennant, M.P.H., Tamara Polach, B.S., Alan L. Rothman, M.D., Jeffrey S. Kennedy, M.D., Mark Wolff, Ph.D., Robert B. Belshe, M.D., and Francis A. Ennis, M.D.

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ABSTRACT

Background We conducted a double-blind, randomized trial of three dilutions of vaccinia virus vaccine in previously unimmunized adults in order to assess the clinical success rates, humoral responses, and virus-specific activity of cytotoxic T cells and interferon-(gamma)–producing T cells.

Methods Sixty healthy adults were inoculated intradermally by bifurcated needle with undiluted vaccine (dose, 10^7.8 pfu per milliliter), a 1:10 dilution (dose, 10^6.5 pfu per milliliter), or a 1:100 dilution (dose, 10^5.0 pfu per milliliter); there were 20 subjects in each group. The subjects were monitored with respect to vesicle formation (an indicator of successful vaccination), the viral titer at the time of peak lesion formation, antiviral antibodies, and cellular immune responses.

Results A vaccinia vesicle developed in 19 of the 20 subjects who received undiluted vaccine (95 percent), 14 of the 20 who received the 1:10 dilution (70 percent), and 3 of the 20 who received the 1:100 dilution (15 percent). One month after vaccination, 34 of 36 subjects with vesicles had antibody responses, as compared with only 1 of 24 subjects without clinical evidence of vaccinia virus replication. Vigorous cytotoxic T-cell and interferon-(gamma) responses occurred in 94 percent of subjects with vesicles, and a cytotoxic T-cell response occurred in only one subject without a vesicle.

Conclusions The vaccinia virus vaccine (which was produced in 1982 or earlier) still has substantial potency when administered by a bifurcated needle to previously unvaccinated adults. Diluting the vaccine reduces the rate of successful vaccination. The development of vesicular skin lesions after vaccination correlates with the induction of the antibody and T-cell responses that are considered essential for clearing vaccinia virus infections. (N Engl J Med 2002;346:1275-80.)

Notice: Because of possible public health implications, this article is being published early (on March 28, 2002). It will appear in the April 25 issue of the Journal.

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