Abstract: A method for measuring influenza B virus by an immunoassay, which method enables specific detection of influenza B virus with a higher sensitivity than conventional methods, and a device or a kit therefor are disclosed. The method for measuring influenza B virus includes carrying out an immunoassay of influenza B virus by a sandwich method using two kinds of monoclonal antibodies each of which specifically reacts with the region of the 125th to 248th amino acids of matrix protein (M1) of influenza B virus, which two kinds of monoclonal antibodies are capable of binding to the region of the 125th to 248th amino acids of M1 at the same time, or antigen-binding fragments thereof.

Abstract: A method for measuring influenza A virus by an immunoassay using an anti-influenza A virus monoclonal antibody which is highly reactive with a wide range of subtypes is disclosed. The method for measuring influenza A virus includes measuring influenza A virus by an immunoassay utilizing antigen-antibody reaction between a monoclonal antibody which specifically reacts with matrix protein (M1) of influenza A virus, or an antigen-binding fragment thereof, and influenza A virus in a sample.

Abstract: A method for measuring influenza B virus by an immunoassay, which method enables specific detection of influenza B virus with a higher sensitivity than conventional methods, and a device or a kit therefor are disclosed. The method for measuring influenza B virus includes carrying out an immunoassay of influenza B virus by a sandwich method using two kinds of monoclonal antibodies each of which specifically reacts with the region of the 125th to 248th amino acids of matrix protein (M1) of influenza B virus, which two kinds of monoclonal antibodies are capable of binding to the region of the 125th to 248th amino acids of M1 at the same time, or antigen-binding fragments thereof.

Abstract: Disclosed is a simple device for a membrane assay using the lateral flow immunoassay method, whereby a subject to be detected can be detected at a high sensitivity, provided with, as a label drying pad, a substrate which has a higher tensile strength than glass fiber and can well release a label. The present invention provides a simple membrane assay device, comprising: a supporting board, a sample supply part, a label containing a labeling component which labels a subject to be detected, a development part formed with a detection part which includes a trapping reagent for detecting or quantifying the subject to be detected, and an absorption part, wherein a non-woven fabric which includes fibers having a fiber diameter of 0.05 to 10 ?m is used in the labeling component part.

Abstract: Disclosed is a simple device for a membrane assay using the lateral flow immunoassay method, whereby a subject to be detected can be detected at a high sensitivity, provided with, as a label drying pad, a substrate which has a higher tensile strength than glass fiber and can well release a label. The present invention provides a simple membrane assay device, comprising: a supporting board, a sample supply part, a label containing a labeling component which labels a subject to be detected, a development part formed with a detection part which includes a trapping reagent for detecting or quantifying the subject to be detected, and an absorption part, wherein a non-woven fabric which includes fibers having a fiber diameter of 0.05 to 10 ?m is used in the labeling component part.