Abstract: The present invention relates to vaccines against influenza virus infection or disease for targets with pre-existing antibodies against influenza virus HA head domain. The invention regards a recombinant vector expressing a HA stem polypeptide, a vaccine comprising the vector or a host cell with said vector, uses of the vector, the host cell, or the vaccine, and methods for reducing influenza virus infection or disease. The recombinant vector can be a nucleic acid such as a eukaryotic expression plasmid or an RNA, a virus, or a replicon particle (RP). This vaccination allows for the induction of an early- and effective immune-response against Influenza virus induced infection or disease, not hindered by pre-existing anti-HA head domain antibodies.

Abstract: The invention relates to the field of coronaviruses and diagnosis, therapeutic use, and vaccines derived therefrom. The invention provides replicative coronaviruses and virus-like particles (VLPs) from which large parts of their genome are (at least functionally) deleted without abolishing their replicative capacities. The deletion preferably results in at least a functional deletion in that the corresponding gene is not or is only partly expressed wherein the resulting gene product is dysfunctional or at least functionally distinct from a corresponding wild-type gene product.