Abstract:
BACKGROUND:Expression of recombinant hemagglutinin (rHA) in insect cells represents a technology with proven efficacy in seasonal influenza and with the potential for a rapid response to the emergence of new, pandemic strains. We evaluated the safety and immunogenicity of rHA vaccine (H5/Indonesia/5/05) produced in SF+ insect cells using a baculovirus expression vector system (BEVS). The rHA vaccine was tested with and without the adjuvant glucopyranosyl lipid A/stable emulsion (GLA/SE). METHODS:Healthy adults 18-49 were randomized to two IM doses on Days 0 and 21 of placebo; unadjuvanted rHA 135 μg or 45 μg, or rHA 45 μg, 15 μg, 7.5 μg or 3.8 μg with GLA/SE. A pioneer group was monitored through Day 42 before randomizing remaining subjects. H5-specific antibody was determined by hemagglutination inhibition (HAI) and microneutralization (MN) on Days 0, 21 and 42. RESULTS:392 subjects were randomized, of whom 380 (97%) received two doses and 386 (98%) completed 12 months of follow-up. Injection site pain and tenderness were seen in 50-70% of rHA+GLA/SE recipients and 4-9% of rHA alone and placebo recipients, but most complaints were mild to moderate in intensity. After two doses, the proportions of subjects with HAI titers ≥1:40 were 32% and 15% in the unadjuvanted 135 μg and 45 μg groups, and 82%, 75%, 66%, and 72% in those receiving 45 μg, 15 μg, 7.5 μg, or 3.8 μg with GLA/SE. The geometric mean titers (GMTs) of HAI antibody on Day 42 were 128, 95, 69, and 72 in the 45 μg, 15 μg, 7.5 μg, or 3.8 μg with GLA/SE groups, respectively. CONCLUSIONS:rHA GLA/SE was well tolerated and immunogenic in healthy adults, and GLA/SE substantially improved the serum antibody response. rHA expressed using BEVS recombinant DNA platform technology represents a promising strategy for pandemic control.
journal_name
Vaccinejournal_title
Vaccineauthors
Treanor JJ,Essink B,Hull S,Reed S,Izikson R,Patriarca P,Goldenthal KL,Kohberger R,Dunkle LMdoi
10.1016/j.vaccine.2013.08.064subject
Has Abstractpub_date
2013-11-19 00:00:00pages
5760-5issue
48eissn
0264-410Xissn
1873-2518pii
S0264-410X(13)01176-6journal_volume
31pub_type
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