Aspects of the disclosure relate to nucleic acid vaccines. The vaccines include one or more RNA polynucleotides having an open reading frame encoding one or more Chikungunya antigen(s), one or more Zika virus antigens, and one or more Dengue antigens. Methods for preparing and using such vaccines are also described.

The invention features modified alphavirus or flavivirus virus-like particles (VLPs). The invention provides methods, compositions, and kits featuring the modified VLPs. The invention also features methods for enhancing production of modified VLPs for use in the prevention or treatment of alphavirus and flavivirus-mediated diseases. The invention also provides methods for delivering agents to a cell using the modified VLPs.

Aspects of the disclosure relate to nucleic acid vaccines. The vaccines include one or more RNA polynucleotides having an open reading frame encoding one or more Chikungunya antigen(s), one or more Zika virus antigens, and one or more Dengue antigens. Methods for preparing and using such vaccines are also described.

The invention features compositions and methods for the prevention or treatment of one or more strains of Chikungunya virus, as well as other alphavirus-mediated diseases.

A virus like particle comprising a viral structural protein which comprises modified envelope protein E3. The viral structural protein may be that derived from or alphavirus or flavivirus. Especially, the viral structural protein may be derived from Chikungunya virus or Venezuelan equine encephalitis virus.

Embodiments disclosed herein provide for antibodies, including neutralizing antibodies, against Chikungunya virus, uses thereof, and methods of identifying antibodies, including neutralizing antibodies, against Chikungunya virus. In some embodiments, antibodies that binds to a CHIKV antigen, wherein the antigen is the CHIKV E1, E2, E3 protein, or any heterocomplex thereof are provided. In some embodiments, the antibody is an isolated antibody, a neutralizing antibody, a recombinant antibody, or any combination thereof. In some embodiments, the antibodies described herein bind to an epitope of E2 Domain A, E2 Domain B, or E1 Domain II of the CHIKV antigen. In some embodiments, the antigen is E2 protein.

The present invention provides compositions and methods comprising a chimeric coronavirus spike protein.

The invention features modified alphavirus or flavivirus virus-like particles (VLPs). The invention provides methods, compositions, and kits featuring the modified VLPs. The invention also features methods for enhancing production of modified VLPs for use in the prevention or treatment of alphavirus and flavivirus-mediated diseases. The invention also provides methods for delivering agents to a cell using the modified VLPs.

The present invention provides compositions and methods for therapeutic immunization for treatment of infectious diseases and/or cancer. Methods of the invention include a method generating a high titer infectious agent and cancer vector, methods of treating and/or preventing cancer or an infection by an infectious disease, and methods of inducing a memory T and B cell immune response against infectious agent and cancer in a subject administered the VLV composition produced thereby. Furthermore, the invention encompasses a pharmaceutical composition for vaccinating a subject to protect the subject against cancer or an infectious agent.

The present invention provides a virus like particle comprising a virus structural protein and an antigen derived from PD-1 or a ligand of PD-1, and a composition or kit comprising thereof, its use in immune response etc.