Safety and immunogenicity profile of a recombinant outer-surface protein A Lyme disease vaccine: clinical trial of a 3-dose schedule at 0, 1, and 2 months.
Clin Ther 2000;
22:315-25. [PMID:
10963286 DOI:
10.1016/s0149-2918(00)80035-1]
[Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
OBJECTIVES
This study compared the tolerability of a Lyme disease vaccine administered intramuscularly at 0 and 1 months with that of a vaccine administered at 0, 1, and 2 months to determine (1) whether adding a third dose of vaccine 1 month after the second would affect the safety profile, and (2) whether a shortened vaccination schedule of 0, 1, and 2 months would provide an immune response similar to that obtained with vaccine administered at 0, 1, and 12 months.
BACKGROUND
An efficacy trial of a Lyme disease vaccine had demonstrated safety and efficacy against definite (clinically manifested and laboratory-confirmed) Lyme disease after 3 doses at 0, 1, and 12 months and resulted in 90% of subjects having titers > or =1400 enzyme-linked immunosorbent assay units (EL.U)/mL (the proposed seroprotective level for 1 tick season).
METHODS
This multicenter, open-label, prospective, randomized study assessed the safety and efficacy of different doses of a recombinant outer-surface protein A (OspA) vaccine in 956 volunteers aged 17 to 72 years from 3 Lyme disease-endemic sites. Blood samples were collected at months 0, 2, 3, 12, and 13 to assess total immunoglobulin-G anti-OspA titers.
RESULTS
Most adverse events were transient and mild to moderate. The geometric mean antibody titer increased 2.8-fold from month 2 (1786 EL.U/mL to 4842 EL.U/mL), and approximately 90% of the volunteers had a titer > or =1400 and 99% had a titer > or =400 EL.U/mL (the mini- mum seroprotective level at any given time) after the third dose. An antibody kinetics model predicts that protection would last for a typical tick-transmission season.
CONCLUSIONS
In volunteers aged 17 to 72 years, 3 doses of vaccine administered in 2 months was well tolerated, more immunogenic than 2 doses, and provided a higher probability of protection before exposure or travel to Lyme disease-endemic areas.
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