BRIGHT ET AL: "Influenza virus-like particles elicit broader immune responses than whole virion inactivated influenza virus or recombinant hemagglutinin", VACCINE, ELSEVIER LTD, GB, vol. 25, no. 19, 19 April 2007 (2007-04-19), pages 3871-3878, XP022033924, ISSN: 0264-410X, DOI: 10.1016/J.VACCINE.2007.01.106 (B1)

GOMEZ-PUERTAS P ET AL: "INFLUENZA VIRUS MATRIX PROTEIN IS THE MAJOR DRIVING FORCE IN VIRUS BUDDING", JOURNAL OF VIROLOGY, THE AMERICAN SOCIETY FOR MICROBIOLOGY, US, vol. 74, no. 24, 1 December 2000 (2000-12-01), pages 11538-11547, XP002196048, ISSN: 0022-538X, DOI: 10.1128/JVI.74.24.11538-11547.2000 (B1)

LATHAM T ET AL: "Formation of wild-type and chimeric influenza virus-like particles following simultaneous expression of only four structural proteins", JOURNAL OF VIROLOGY, THE AMERICAN SOCIETY FOR MICROBIOLOGY, US, vol. 75, no. 13, 1 July 2001 (2001-07-01), pages 6154-6165, XP002323947, ISSN: 0022-538X, DOI: 10.1128/JVI.75.13.6154-6165.2001 (B1)

WO-A2-2007/047831 (B1)

PUSHKO ET AL: "Influenza virus-like particles comprised of the HA, NA, and M1 proteins of H9N2 influenza virus induce protective immune responses in BALB/c mice", VACCINE, ELSEVIER LTD, GB, vol. 23, no. 50, 30 December 2005 (2005-12-30), pages 5751-5759, XP005180698, ISSN: 0264-410X, DOI: 10.1016/J.VACCINE.2005.07.098 (B1)

WO-A2-2005/020889 (B1)

MURPHY B R ET AL: "Characterization of the M protein and nucleoprotein genes of an avian influenza A virus which are involved in host range restriction in monkeys", VACCINE, ELSEVIER LTD, GB, vol. 7, no. 6, 1 December 1989 (1989-12-01), pages 557-561, XP025438342, ISSN: 0264-410X, DOI: 10.1016/0264-410X(89)90283-1 [retrieved on 1989-12-01] (B1)