Abstract: Disclosed are methods for detecting if a biological sample (e.g., saliva, serum, blood, plasma) contains IgA antibodies against SARS-CoV-2 S glycoproteins. The method includes contacting a biological sample with a SARS-CoV-2 S glycoprotein-coated surface, contacting the surface with a secondary antibody, and detecting the secondary antibody, where if a secondary antibody is detected, the sample contains IgA antibodies against the SARS-CoV-2 S glycoprotein. Assay substrates and kits for performing such methods are also disclosed.

Abstract: Disclosed are methods for detecting if a biological sample (e.g., saliva, serum, blood, plasma) from a subject that has been administered a an immunogenic composition directed to a seasonal influenza virus and an immunogenic composition directed to a SARS-COV-2 virus contains antibodies that inhibit influenza virus hemagglutinin (HA) glycoprotein hemagglutination activity, antibodies that neutralize SARS-COV-2 virus, antibodies that bind SARS-COV-2 spike protein, and/or antibodies that neutralize seasonal influenza virus. The methods include assaying a biological sample, where the biological sample is from a subject that has been administered an immunogenic composition directed to a seasonal influenza virus and an immunogenic composition directed to a SARS-COV-2 virus, and is not significantly affected by interference of analyte detection between the methods.

Abstract: Disclosed are methods for detecting if a biological sample (e.g., saliva, serum, blood, plasma) contains antibodies that inhibit influenza virus hemagglutinin (HA) glycoprotein hemagglutination activity. The method includes reducing or removing non-specific inhibitors of HA from the biological sample to produce a treated sample; exposing the treated sample to an influenza virus having an HA glycoprotein to produce a sample-virus mixture; incubating the sample-virus mixture with human red blood cells (RBCs), the human RBCs being at a concentration of about 0.5% to about 1%; and detecting agglutination of the human RBCs. Assay kits and methods for using the assay to select an immunogenic composition for use as a vaccine are also provided.

Abstract: Disclosed are methods for detecting if a biological sample (e.g., serum, blood, plasma) contains antibodies against SARS-CoV-2 S glycoproteins comprising: (i) providing a surface coated with a SARS-CoV-2 S glycoprotein; (ii) exposing the surface to the biological sample; (iii) exposing the surface to a secondary antibody; and (iv) detecting the secondary antibody that is bound to the surface; wherein the biological sample contains antibodies that bind to the SARS-CoV-2 S glycoprotein if secondary antibody is detected.

Abstract: The invention relates to a vaccine for the treatment of disease caused by Neisseria, the vaccine including one or more immunogenic components for Neisseria serogroups, as well as antibodies to the immunogenic components and methods of preventing and treating Neisseria infections. The immunogens are based on elements of the inner core lipopolysaccharide.

Abstract: The invention relates to a vaccine for the treatment of disease caused by Neisseria, the vaccine including one or more immunogenic components for Neisseria serogroups, as well as antibodies to the immunogenic components and methods of preventing and treating Neisseria infections. The immunogens are based on elements of the inner core lipopolysaccharide.

Abstract: The invention relates to a vaccine for the treatment of disease caused by Neisseria, the vaccine including one or more immunogenic components for Neisseria serogroups, as well as antibodies to the immunogenic components and methods of preventing and treating Neisseria infections. The immunogens are based on elements of the inner core lipopolysaccharide.