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Dose-dependent neutralizing-antibody responses to vaccinia
Robert B Belshe1, Frances K Newman, Sharon E Frey
1Center for Vaccine Development, Saint Louis University School of Medicine, St. Louis, Missouri 63110, USA. belsherb@slu.edu
The Journal of Infectious Diseases
|January 28, 2004
Summary
Diluting smallpox vaccine (Dryvax) increased neutralizing-antibody titers compared to undiluted vaccine. Higher antibody responses correlated with larger vaccination lesions and fever, indicating robust immune reactions.
Area of Science:
- Immunology
- Vaccinology
- Virology
Background:
- Smallpox vaccine stocks, including Dryvax, are crucial for public health preparedness.
- Understanding humoral immune responses to different vaccine preparations is essential for efficacy assessment.
- Evaluating dose-response relationships can optimize vaccine administration strategies.
Purpose of the Study:
- To assess humoral immune responses to available U.S. smallpox vaccine stocks (Dryvax).
- To compare immune responses between undiluted and diluted smallpox vaccine lots.
- To generate data for newly produced smallpox vaccine lots.
Main Methods:
- A randomized, single-blinded trial involving 674 vaccinated subjects.
- Administration of undiluted, 1:5 diluted, or 1:10 diluted smallpox vaccine.
- Measurement of plaque-reduction neutralizing-antibody titers at 28 and 56 days post-vaccination.
- Correlation analysis of antibody titers with clinical outcomes (vesicle development, lesion size, fever).
Main Results:
- All subjects developing a vaccination vesicle showed neutralizing antibodies by day 28.
- Significantly higher neutralizing-antibody titers were observed in subjects receiving 1:5 or 1:10 vaccine dilutions compared to undiluted vaccine.
- Larger lesion size and fever post-vaccination were associated with significantly higher neutralizing-antibody titers.
Conclusions:
- Diluted smallpox vaccine (1:5 or 1:10) elicits a stronger neutralizing antibody response than undiluted vaccine.
- Clinical indicators like lesion size and fever correlate with enhanced humoral immunity.
- Findings support the evaluation of vaccine dilutions for optimizing immune responses.