Abstract：
:The outbreak of highly pathogenic avian influenza virus in North American poultry during 2014 and 2015 demonstrated the devastating effects of the disease and highlighted the need for effective emergency vaccine prevention and control strategies targeted at currently circulating strains. This study evaluated the efficacy of experimental recombinant turkey herpesvirus vector vaccines with three different inserts targeting the hemagglutinin gene of an isolate from the recent North American influenza outbreak. White leghorn chickens were vaccinated at one day of age and challenged with A/Turkey/Minnesota/12582/2015 H5N2 at 4 weeks of age. Birds were analyzed for survival, viral shedding at two and four days after infection, and specific antibody prior to challenge and from surviving birds. The three experimental vaccines demonstrated 100%, 45% and 15% survival with the most effective vaccine significantly reducing oral and cloacal viral shedding compared to all other groups and generated specific antibody prior to challenge with highly pathogenic avian influenza virus. More studies are needed using diverse H5Nx highly pathogenic virus isolates to fully determine the breadth of coverage against possible exposure strains, as well as possible impact of maternally derived antibody on protection and vaccine efficacy.
journal_name
Vaccinejournal_title
Vaccineauthors
Balzli CL,Bertran K,Lee DH,Killmaster L,Pritchard N,Linz P,Mebatsion T,Swayne DEdoi
10.1016/j.vaccine.2017.11.026subject
Has Abstractpub_date
2018-01-02 00:00:00pages
84-90issue
1eissn
0264-410Xissn
1873-2518pii
S0264-410X(17)31590-6journal_volume
36pub_type
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