tetano
Editor, Senior Moderator
Clin Vaccine Immunol. 2011 Dec 21. [Epub ahead of print]
ANTIBODY BREADTH AND PROTECTIVE EFFICACY IS INCREASED BY VACCINATION WITH COMPUTATIONALLY OPTIMIZED HEMAGGLUTININ BUT NOT WITH POLYVALENT HEMAGGLUTININ BASED H5N1 VLP VACCINES.
Giles BM, Bissel SJ, Dealmeida DR, Wiley CA, Ross TM.
Source
Center for Vaccine Research.
Abstract
One of the challenges for developing an H5N1 influenza vaccine is the diversity of antigenically distinct isolates within this subtype. Previously, our group described a novel hemagglutinin derived from a methodology termed computationally optimized broadly reactive antigen (COBRA). This COBRA HA, when used as an immunogen, elicits a broad antibody response against H5N1 isolates from different clades. In this report, the immune responses elicited by the COBRA HA virus-like particle (VLP) vaccine were compared to responses elicited by a mixture of VLPs expressing representative HA molecules from clade 2.1, 2.2, and 2.3 primary H5N1 isolates (polyvalent). COBRA HA VLP elicited higher titer antibodies to a panel of H5N1 HA proteins. Both COBRA and polyvalent vaccines protected vaccinated mice and ferrets from experimental infection with highly lethal H5N1 influenza viruses, but COBRA vaccinated animals had decreased viral replication, less inflammation in the lungs of mice, and reduced virus recovery in ferret nasal washes. Both vaccines had similar cellular responses post-challenge indicating that higher titer serum antibody likely restricts the duration of viral replication. Furthermore, passively transferred immune serum from COBRA HA VLP vaccinated mice protected recipient animals more efficiently than immune serum from polyvalent vaccinated mice. This is the first report comparing these two vaccine strategies. The single COBRA HA antigen elicited a broader antibody response and reduced morbidity and viral titers more effectively than a polyvalent mixture of primary H5N1 HA antigens.
PMID:
22190399
[PubMed - as supplied by publisher]
http://www.ncbi.nlm.nih.gov/pubmed/22190399
ANTIBODY BREADTH AND PROTECTIVE EFFICACY IS INCREASED BY VACCINATION WITH COMPUTATIONALLY OPTIMIZED HEMAGGLUTININ BUT NOT WITH POLYVALENT HEMAGGLUTININ BASED H5N1 VLP VACCINES.
Giles BM, Bissel SJ, Dealmeida DR, Wiley CA, Ross TM.
Source
Center for Vaccine Research.
Abstract
One of the challenges for developing an H5N1 influenza vaccine is the diversity of antigenically distinct isolates within this subtype. Previously, our group described a novel hemagglutinin derived from a methodology termed computationally optimized broadly reactive antigen (COBRA). This COBRA HA, when used as an immunogen, elicits a broad antibody response against H5N1 isolates from different clades. In this report, the immune responses elicited by the COBRA HA virus-like particle (VLP) vaccine were compared to responses elicited by a mixture of VLPs expressing representative HA molecules from clade 2.1, 2.2, and 2.3 primary H5N1 isolates (polyvalent). COBRA HA VLP elicited higher titer antibodies to a panel of H5N1 HA proteins. Both COBRA and polyvalent vaccines protected vaccinated mice and ferrets from experimental infection with highly lethal H5N1 influenza viruses, but COBRA vaccinated animals had decreased viral replication, less inflammation in the lungs of mice, and reduced virus recovery in ferret nasal washes. Both vaccines had similar cellular responses post-challenge indicating that higher titer serum antibody likely restricts the duration of viral replication. Furthermore, passively transferred immune serum from COBRA HA VLP vaccinated mice protected recipient animals more efficiently than immune serum from polyvalent vaccinated mice. This is the first report comparing these two vaccine strategies. The single COBRA HA antigen elicited a broader antibody response and reduced morbidity and viral titers more effectively than a polyvalent mixture of primary H5N1 HA antigens.
PMID:
22190399
[PubMed - as supplied by publisher]
http://www.ncbi.nlm.nih.gov/pubmed/22190399