Journal
VACCINE
Volume 27, Issue 42, Pages 5913-5919Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.vaccine.2009.07.038
Keywords
Respiratory Syncytial Virus; Vaccine; Elderly
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We studied the safety and immunogenicity of a Respiratory Syncytial Virus (RSV)-A vaccine containing subunit antigens F, G and M in older persons, and its effect on influenza vaccine immunogenicity. In a dose-ranging, placebo-controlled, blinded trial 561 adults >= 65 years of age at five Canadian sites were randomized to one intramuscular injection of either 100, 50 or 25 mu g RSV-A-alum vaccine or 100 mu g non-adjuvanted RSV-A vaccine, or alum-placebo. All participants were offered inactivated influenza vaccine on day 32. Immunization was well tolerated and reactogenicity was similar between the RSV and influenza vaccines and the alum-placebo. Only the 100 mu g non-adjuvanted RSV vaccine achieved the primary immunogenicity outcome of eliciting a >= 4-fold rise in neutralizing antibody (NA) titres against RSV-A in >= 50% of participants at day 32. Geometric mean titres against RSV-A and -B at all points were comparable in 100 mu g adjuvanted and non-adjuvanted groups. At day 32, a >= 4-fold haemagluttinin inhibition (HI) antibody response or HI >= 40 to Influenza (A-H3N2) was seen in >74% of participants: no difference was seen between groups. A subunit non-alum-containing RSV-A vaccine was well tolerated in a large population >= 65 years and did not interfere with influenza vaccine immunogenicity. This RSV-A-based vaccine demonstrated NA rise which could provide seasonal protection against severe RSV illnesses from RSV-A or -B and warrants further testing to determine its efficacy in the prevention of clinical illness in elderly persons. (C) 2009 Elsevier Ltd. All rights reserved.
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