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In page Virus-like particle:

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Research suggests that VLP vaccines against influenza virus could provide stronger and longer-lasting protection against flu viruses than conventional vaccines.[3] Production can begin as soon as the virus strain is sequenced and can take as little as 12 weeks, compared to 9 months for traditional vaccines. In early clinical trials, VLP vaccines for influenza appeared to provide complete protection against both the Influenza A virus subtype H5N1 and the 1918 flu pandemic.[4] Novavax and Medicago Inc. have run clinical trials of their VLP flu vaccines.[5][6]