Metapneumovirus strains and their use in vaccine formulations and as vectors for expression of antigenic sequences

Abstract

The present invention provides an isolated mammalian negative strand RNA virus, metapneumovirus (MPV), within the sub-family Pneumoviridae, of the family Paramyxoviridae. The invention also provides isolated mammalian negative strand RNA viruses identifiable as phylogenetically corresponding or relating to the genus Metapneumovirus and components thereof. In particular the invention provides a mammalian MPV, subgroups and variants thereof. The invention relates to genomic nucleotide sequences of different isolates of mammalian metapneumoviruses, in particular human metapneumoviruses. The invention relates to the use of the sequence information of different isolates of mammalian metapneumoviruses for diagnostic and therapeutic methods. The present invention relates to nucleotide sequences encoding the genome of a metapneumovirus or a portion thereof, including both mammalian and avian metapneumovirus. The invention further encompasses chimeric or recombinant viruses encoded by said nucleotide sequences. The invention also relates to chimeric and recombinant mammalian MPV that comprise one or more non-native or heterologous sequences. The invention further relates to vaccine formulations comprising mammalian or avian metapneumovirus, including recombinant and chimeric forms of said viruses. The vaccine preparations of the invention encompass multivalent vaccines, including bivalent and trivalent vaccine preparations.

Description

[0001] This application claims priority to U.S. Provisional Patent Application No. 60 / 358,934, filed Feb. 21, 2002, which is incorporated by reference herein in its entirety.[0002] Copending and co-assigned U.S. Patent Application ______, filed on even date herewith, listing Ronaldus Fouchier, Bemadetta van den Hoogen, Albertus Osterhaus, Aurelia Haller, and Roderick Tang as Inventors, entitled "Recombinant Parainfluenza Virus Expression Systems and Vaccines Comprising Heterologous Antigens Derived from Metapneumovirus", is incorporated herein by reference in its entirety.1. INTRODUCTION[0003] The invention relates to an isolated mammalian negative strand RNA virus, metapneumovirus (MPV), within the sub-family Pneumoviridae, of the family Paramyxoviridae. The present invention also relates to isolated mammalian negative strand RNA viruses identifiable as phylogenetically corresponding or relating to the genus Metapneumovirus and components thereof. The invention relates to genomic n...

AI Technical Summary

Problems solved by technology

However, a proportion of the illnesses observed among mammals can still not be attributed to known pathogens.

The Colorado strain of APV does not protect SPF chicks against challenge with either a subgroup A or a subgroup B strain of TRT virus.

Parainfluenza viral infection results in serious respiratory tract disease in infants and children.

Treatment options for established RSV disease are limited.

While a vaccine might prevent RSV infection, and / or RSV-related disease, no vaccine is yet licensed for this indication.

A major obstacle to vaccine development is safety.

Finally, primary RSV infection and disease do not protect well against subsequent RSV disease (Henderson et al., 1979, New Engl. J. Med. 300:530-534).

While this is a major advance in preventing RSV infection, this treatment poses certain limitations in its widespread use.

Second, the concentrations of active material in hyperimmune globulins are insufficient to treat adults at risk or most children with comprised cardiopulmonary function.

Third, intravenous infusion necessitates monthly hospital visits during the RSV season.

Finally, it may prove difficult to select sufficient donors to produce a hyperimmune globulin for RSV to meet the demand for this product.

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