Provided herein are vaccine compositions for example in a dry powder form for intranasal delivery, and their preparation methods. Also provided are methods of using vaccine compositions, for example in stimulating mucosal or systemic immune responses by delivering the vaccine compositions intranasally.

The present is directed to compositions comprising regulatory T cell epitopes, wherein said epitopes comprises a polypeptide comprising at least a portion of SEQ ID NOS: 4-370, 391-440, and 448-833 (and/or fragments and variants thereof), and optionally 1 to 12 additional amino acids distributed in any ratio on the N-terminus and/or C-terminus of the polypeptide of SEQ ID NOS: 4-370, 391-440, and 448-833, as well as methods of producing and using the same. The present is further directed to detolerized antigens to the regulatory T cell epitopes, including proteins or polypeptides of SARS-CoV-2 wherein one or more of the identified T cell epitopes are deleted, partially deleted and/or mutated.

The invention relates to composite antigens comprising an antigen obtained or derived from an antigenic epitope of one or more pathogens that induces an immune response in a mammal, an antigen obtained or derived from bacterial cell wall material that induces an immune response in a mammal such as LTA, PNG or LPS, and a T cell stimulating antigen such as CRM. Preferably the composite antigen comprises an immunogenic composition or a vaccine that is effective against the pathogen or can generate antibodies that can be collected that are protective against infection by the pathogen. In addition, the invention relates to vaccines comprising composite antigens and to method for treating and preventing an infection.

The present invention relates to immunogenic compositions comprising RSV F protein, methods for preparing compositions that contain RSV F protein ecto-domain polypeptides, and to certain engineered RSV F proteins and nucleic acids that encode the engineered RSV F proteins. Compositions prepared using the methods can contain RSV F protein ecto-domain polypeptides in a predominant or single desired form and conformation. The invention also relates to methods for inducing an immune response to RSV F.

Disclosed herein are nanoparticles comprising mannose conjugated chitosan and an inactivated influenza A virus (IAV) antigen, wherein the mannose conjugated chitosan encapsulates the inactivated IAV antigen. In some embodiments, the nanoparticle further comprises tripolyphosphate. Also disclosed are methods of reducing transmission of an influenza A virus, and methods of eliciting an immune response against an influenza A virus, in a subject compared to a control comprising administering to the subject a nanoparticle comprising mannose conjugated chitosan and an inactivated influenza A virus (IAV) antigen, wherein the mannose conjugated chitosan encapsulates the inactivated IAV antigen.

Attenuated G9P[6] rotavirus is disclosed herein. In some embodiments, pharmaceutical compositions are disclosed that include an attenuated G9P[6] rotavirus, or a component thereof. These compositions can be used to induce an immune response, such as a protective immune response, to a rotavirus. The compositions can be used as vaccines, such as for children (infants), for example in a prime boost strategy.

The invention provides a swine influenza vaccine composition as part of a vaccine package where the composition produces one or more T cell epitopes that are highly conserved in circulating influenza strains including those of H1N1 and others. The invention addresses variability amongst the influenza viruses from year to year, and therefore, provides great economic relief to pork farmers. The invention further provides a preferred, heterologous vaccine regimen embodiment where a DNA vaccine, such as the composition disclosed herein, is used in combination with a more conventional vaccine, such as one based on part or whole of an inactivated virus.

The present disclosure belongs to the technical field of biological products for veterinary medicine, and specifically relates to a recombinant foot-and-mouth disease virus (FMDV) with a reduced immunosuppressive activity, a preparation method and use thereof, and a recombinant vaccine strain. According to the present disclosure, it is firstly discovered that FMDV 3B protein has an immunosuppressive function, and key sites for exerting the immunosuppressive function are found. A recombinant FMDV vaccine strain with a lost immunosuppressive function in FMDV 3B protein is constructed by introducing amino acid mutations into three repeated copies of FMDV 3B protein.

The present invention relates to killed/inactivated and/or recombinant Senecavirus A immunogenic compositions and vaccines, and methods of preventing or treating animals in need of with such an immunogenic compositions and vaccines.

An immunogenic composition comprising of Diphtheria toxoid antigen (D), tetanus toxoid (T) antigen, Hepatitis B surface antigen (HBsAg), inactivated whole-cell B. pertussis (wP) antigen, Haemophilus influenzae type B (Hib) capsular saccharide conjugated to a carrier protein, Inactivated Polio Virus (IPV) antigen and additionally one or more antigens and the method of preparing the same. A fully liquid combination vaccine, showing improved immunogenicity, reduced reactogenicity and improved stability. Improved methods of formaldehyde inactivation, improved adsorption profile of Diphtheria toxoid antigen (D), tetanus toxoid (T) antigen and Hepatitis B (HepB) surface antigen adsorbed individually onto aluminium phosphate adjuvant, minimum total aluminum content (Al.sup.3+) and optimized concentration of 2-phenoxyethanol (2-PE) as preservative.