J Infect Dis. Antibody persistence after 2-dose priming and booster response to a third dose of an inactivated, adjuvanted, whole-virion H5N1 vaccine.

[Giuseppe]

J Infect Dis. 2009 Jan 15;199(2):184-7.

Antibody persistence after 2-dose priming and booster response to a third dose of an inactivated, adjuvanted, whole-virion H5N1 vaccine.

Lin JT, Li CG, Wang X, Su N, Liu Y, Qiu YZ, Yang M, Chen JT, Fang HH, Dong XP, Yin WD, Feng ZJ. - China-Japan Friendship Hospital, Beijing, China.

An inactivated, alum-adjuvanted, whole-virion H5N1 vaccine had been evaluated previously.
Hemagglutination inhibition (HI) assays showed that the antibody levels declined significantly, with 4.8%-20.8% and 0%-18.8% of participants retaining seroprotection (HI titer >or=1:40) 6 and 12 months after the second dose, respectively.
A third dose of the same vaccine given 12 months after the second dose significantly boosted immune responses.
Thirty days after the third dose in the 1.25-, 2.5-, 5-, and 10-microg dose groups, 29.4%, 31.3%, 78.6%, and 90.0% of participants had HI titers >or=1:40, and 52.9%, 81.2%, 92.9%, and 100% of participants had microneutralization titers >or=1:40, respectively. Both the 5-microg and 10-microg doses met European Union criteria.

PMID: 19067606 [PubMed - indexed for MEDLINE]
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