PEDIATRICS Vol. 108 No. 1 July 2001, pp. 123-128
Received Aug 11, 2000; accepted Nov 2, 2000.
,
,
From the * Division of Rheumatology/Immunology, Department of
Medicine, Tufts University School of Medicine, Boston, Massachusetts;
Objective. A recombinant lipoprotein
outer surface protein A (OspA) Lyme disease (LD) vaccine (LYMErix) has
been shown to be safe and effective in preventing LD in adults and in
adolescents 15 years of age and older. Children are at risk for
developing LD. This clinical study was conducted to address the safety
and immunogenicity of LD vaccine in children 4 to 18 years of age.
Methods. A randomized, placebo-controlled clinical trial
was conducted at 17 investigational sites in Lyme-endemic areas in the
United States. Immunogenicity data from this study also were compared with data obtained from the adult efficacy study. A total of 4090 healthy children and adolescents (age range: 4-18; mean age: 10.4 years) were randomized; 4087 were vaccinated, and a subset of 301 children participated in the immunogenicity analysis. Children were
randomized to receive either 30 µg of LD vaccine
(N = 3063) or placebo (N = 1024) on a 0, 1, 12-month schedule. Safety assessments evaluated both
solicited (local: redness, swelling, and pain; general: fever,
headache, fatigue, arthralgia, and rash) and unsolicited adverse
events. Serum specimens were collected at month 0 or month 2, and
months 6, 12, and 13.
Results. Solicited reactogenicity data revealed a higher
incidence of local injection site reactions and general symptoms
(fever, headache, fatigue, and arthralgia) in vaccine than placebo
recipients. The majority of events were limited in duration (mean: 2-3
days) and were mild to moderate in severity. The total IgG anti-OspA
geometric mean titer (GMT) in the pediatric vaccine recipients at month 13 was as good as and statistically higher than the GMT in the adult
cohort at month 13 (27 485 enzyme-linked immunosorbent assay units
[EL.U]/mL vs 8216 EL.U /mL). All of the pediatric vaccine recipients
attained a level of antibody concentration Conclusions. LD vaccine administered on a 0, 1, 12-month
schedule generally is well tolerated and immunogenic in children 4 to
18 years of age. The safety profile consists of mild to moderate local injection site reactions and flu-like symptoms of limited duration and did not worsen with subsequent injections. IgG GMT at month 13 was
threefold higher than the month 13 GMT obtained in the adult efficacy
study. This higher immune response in children should provide
protection against LD.
Department of International Health, Johns Hopkins University School
of Public Health, Baltimore, Maryland; § Department of Pediatrics,
Connecticut Children's Medical Center, Hartford, Connecticut;
Division of Infectious Diseases, Long Island Jewish Health
System-Children's Health Network of North Shore, New Hyde Park, New
York; ¶ Norwich Pediatric Group, Norwich, Connecticut; # SmithKline
Beecham Biologicals, Rixensart, Belgium; and ** SmithKline Beecham
Biologicals, Collegeville, Pennsylvania.
1400 EL.U/mL (proposed
seroprotective level) compared with 90% of adults attaining levels
1400 EL.U/mL in the efficacy trial.
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