The present invention relates to novel stabilized IgG4 antibodies, to methods of producing such antibodies and to uses of such antibodies as a medicament. In a main aspect, the invention relates to a stabilized IgG4 antibody, comprising a heavy chain and a light chain, wherein said heavy chain comprises a human IgG4 constant region having a substitution of the Arg residue at position (409), the Phe residue at position (405) or the Lys residue at position (370).

The present disclosure relates to the composition of one or more agents, therapies, treatments, and methods of use of the agents and/or therapies and/or treatments for upregulating production of two or more antibodies, one or more bi-specific antibodies, or combinations thereof. Embodiments of the present disclosure can be used as a therapy or a treatment of a conditions including: sepsis, parasites, and active and chronic infections caused by bacteria, non-hemorrhagic viruses, amoeba, mycoplasma, fungus, prions or combinations thereof.

Disclosed herein are antibodies or immunogenic fragments thereof that specifically bind to Epstein-Barr virus (EBV) glycoprotein 350 (gp350) or 220 or one or more epitopes of EBV gp350 and neutralize EBV infection. Also disclosed are immunogenic peptides comprising one or more gp350 epitopes, EBV antibody-small molecule conjugates and pharmaceutical compositions comprising the antibody or an immunogenic fragment thereof, one or more epitopes of EBV gp350, one or more immunogenic peptides, or the EBV antibody-small molecule conjugate. The antibodies, epitopes, immunogenic peptides, conjugates, and pharmaceutical compositions can be used to treat or prevent EBV infections and EBV-associated conditions and diseases.

Provided herein are compounds, compositions, and methods for the treatment of diseases and disorders associated with influenza, including VX-787 and derivatives thereof, baloxavir and derivatives thereof, and baloxavir marboxil and derivatives thereof, and protein (e.g., antibody) drug conjugates thereof.

The invention provides therapeutic humanized anti-HERV-K antibodies, CAR, or a fusion thereof consisting of a hispecific T ceil engager (BiTE) FOR CD3 and CDS, a DNA-encoded BiTE (DBiTE), or an antibody-drug conjugate (ADC). The invention also relates to peptides, proteins, nucleic acids, and cells for use in immunotherapeutic methods. In particular, the invention relates to the immunotherapy of cancer peptides bound to molecules of the MHC, or peptides as such, which can also be targets of antibodies and other binding molecules.

Provided herein are a mutant envelope protein of Zika virus and a nucleic acid molecule including a nucleotide sequence encoding the mutant envelope protein. The mutant envelope protein, which preferably has a threonine substitution at 105.sup.th position, or an asparagine substitution at 248.sup.th position and a threonine substitution at 250.sup.th position in an amino acid sequence of SEQ ID NO: 1, includes an N-glycan masking a fusion loop region of the mutant envelope protein of Zika virus. Also provided herein is a vaccine composition, including the mutant envelope protein or a recombinant virus including the nucleic acid molecule. Also provided herein is a method of preventing Zika virus infection and reducing antibody-dependent enhancement of dengue virus infection, including administering to a subject in need thereof an effective amount of a vaccine composition including the mutant envelope protein of Zika virus.

In various embodiments nanoparticle drug delivery vehicles are provided that specifically deliver a cargo to a target pathogenic organism. In certain embodiments the drug delivery vehicle comprises a mesoporous silica nanoparticle comprising a plurality of pores and an outer surface through which the pores are disposed; a cargo disposed in the pores; one or more antigens attached to the surface of the nanoparticle; an antibody that specifically binds the antigens and are bound to the antigens, wherein the antibody inhibits diffusion of the cargo out of the pores and permit release of the cargo when the drug delivery vehicle is in the presence of the antigen or a pathogen displaying the antigen.

Provided herein are a mutant envelope protein of Zika virus and a nucleic acid molecule including a nucleotide sequence encoding the mutant envelope protein. The mutant envelope protein, which preferably has a threonine substitution at 105.sup.th position, or an asparagine substitution at 248.sup.th position and a threonine substitution at 250.sup.th position in an amino acid sequence of SEQ ID NO: 1, includes an N-glycan masking a fusion loop region of the mutant envelope protein of Zika virus. Also provided herein is a vaccine composition, including the mutant envelope protein or a recombinant virus including the nucleic acid molecule. Also provided herein is a method of preventing Zika virus infection and reducing antibody-dependent enhancement of dengue virus infection, including administering to a subject in need thereof an effective amount of a vaccine composition including the mutant envelope protein of Zika virus.

The present invention provides heavy chain immunoglobulins of the VHH type or fragment thereof having affinity for a target antigen of interest, including glycoprotein D2 (gD2) of HSV-2 or antigen thereof, and for envelope proteins of HIV-1 or an antigen thereof linked to Pseudomonas exotoxin A or functional fragments thereof. Also included are multimeric forms of the immunoglobulins and their use in the prevention and/or treatment of HSV2 and/or HIV-1.

The disclosure is directed to a histidine-mutated anti-HIV antibody having one or more mutations at the residue Y53a, D58, K96, D97, N98, or T100a in the heavy chain of ibalizumab, and at the residue S26, L30, L33, Q89, Y92, S93 or Y94 in the light chain of ibalizumab. In addition, the disclosure also is directed to two histidine mutated variants with two mutations, one with mutations at the residues Y53a and Y94, and the other with mutations at the residues D58 and L30 in the heavy and light chains of ibalizumab, respectively.