title: A recombinant Hendra virus G glycoprotein-based subunit vaccine protects ferrets from lethal Hendra virus challenge.
abstract: The henipaviruses, Hendra virus (HeV) and Nipah virus (NiV), are two deadly zoonotic viruses for which no vaccines or therapeutics have yet been approved for human or livestock use. In 14 outbreaks since 1994 HeV has been responsible for multiple fatalities in horses and humans, with all known human infections resulting from close contact with infected horses. A vaccine that prevents virus shedding in infected horses could interrupt the chain of transmission to humans and therefore prevent HeV disease in both. Here we characterise HeV infection in a ferret model and show that it closely mirrors the disease seen in humans and horses with induction of systemic vasculitis, including involvement of the pulmonary and central nervous systems. This model of HeV infection in the ferret was used to assess the immunogenicity and protective efficacy of a subunit vaccine based on a recombinant soluble version of the HeV attachment glycoprotein G (HeVsG), adjuvanted with CpG. We report that ferrets vaccinated with a 100 μg, 20 μg or 4 μg dose of HeVsG remained free of clinical signs of HeV infection following a challenge with 5000 TCID₅₀ of HeV. In addition, and of considerable importance, no evidence of virus or viral genome was detected in any tissues or body fluids in any ferret in the 100 and 20 μg groups, while genome was detected in the nasal washes only of one animal in the 4 μg group. Together, our findings indicate that 100 μg or 20 μg doses of HeVsG vaccine can completely prevent a productive HeV infection in the ferret, suggesting that vaccination to prevent the infection and shedding of HeV is possible.
authors.affiliation: CSIRO Livestock Industries, Australian Animal Health Laboratory, 5 Portarlington Road, Geelong, VIC 3220, Australia. jackie.pallister@csiro.au
authors.forename: Jackie
authors.initials: J
authors.lastname: Pallister
authors.forename: Deborah
authors.initials: D
authors.lastname: Middleton
authors.forename: Lin-Fa
authors.initials: LF
authors.lastname: Wang
authors.forename: Reuben
authors.initials: R
authors.lastname: Klein
authors.forename: Jessica
authors.initials: J
authors.lastname: Haining
authors.forename: Rachel
authors.initials: R
authors.lastname: Robinson
authors.forename: Manabu
authors.initials: M
authors.lastname: Yamada
authors.forename: John
authors.initials: J
authors.lastname: White
authors.forename: Jean
authors.initials: J
authors.lastname: Payne
authors.forename: Yan-Ru
authors.initials: YR
authors.lastname: Feng
authors.forename: Yee-Peng
authors.initials: YP
authors.lastname: Chan
authors.forename: Christopher C
authors.initials: CC
authors.lastname: Broder
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000276:immunology; D005289:Ferrets / Q000276:immunology / Q000821:virology; D006023:Glycoproteins / Q000276:immunology; D045404:Hendra Virus / Q000276:immunology*; D045464:Henipavirus Infections / Q000276:immunology / Q000517:prevention & control; D011994:Recombinant Proteins / Q000276:immunology; D022223:Vaccines, Subunit / Q000276:immunology*; D014614:Vaccines, Synthetic / Q000276:immunology; D014759:Viral Envelope Proteins / Q000276:immunology*; D014765:Viral Vaccines / Q000276:immunology*; D017201:Virus Shedding / Q000276:immunology
chemical_list: D000914:Antibodies, Viral; D006023:Glycoproteins; D011994:Recombinant Proteins; D022223:Vaccines, Subunit; D014614:Vaccines, Synthetic; D014759:Viral Envelope Proteins; D014765:Viral Vaccines