Growth-inhibiting antibody responses of humans vaccinated with recombinantouter surface protein A or infected with Borrelia burgdorferi or both

Serial serum samples from a 2-year human trial of outer surface protein (Os p) A vaccine were analyzed by Borrelia burgdorferi growth-inhibition assay (GIA) and anti-OspA ELISA to assess the antibody responses of vaccine recip ients and subjects with Lyme disease. Although 74% of OspA recipients had a reciprocal GIA titer greater than or equal to 64 after 3 vaccinations, non e of the placebo recipients, even those with Lyme disease, had a GIA titer this high. The correlation between GIA and ELISA titers after 3 doses of va ccine was .84; however, more vaccine recipients had an elevated ELISA titer paired with low GIA titer than had a low ELISA titer with a high GIA titer . OspA-vaccine recipients who acquired Lyme disease had significantly lower serum GIA and ELISA titers after 3 immunizations than did age- and sex-mat ched OspA recipients without Lyme disease. Thus, vaccinated subjects had an tibodies to native antigen on viable cells, and antibody assays with this s pecificity may predict protection of vaccinees against infection.