NOROVIRUS ANTIBODY

It is an object of the present invention to provide an antibody that inhibits infection of cells with a norovirus， wherein the antibody is a nanoantibody comprising a polypeptide described in the following (a)， (b)， or (c)， and inhibiting infection of intestinal cells with HuNoV GII.3 and/or HuNoV GII.4: (a) a polypeptide consisting of the amino acid sequence as set forth in SEQ ID NO: 1， SEQ ID NO: 5， SEQ ID NO: 9， or SEQ ID NO: 13; (b) a polypeptide consisting of an amino acid sequence comprising a substitution， deletion， insertion and/or addition of one or several amino acids with respect to the amino acid sequence as set forth in SEQ ID NO: 1， SEQ ID NO: 5， SEQ ID NO: 9， or SEQ ID NO: 13; and (c) a polypeptide consisting of an amino acid sequence having a sequence identity of 80% or more to the amino acid sequence as set forth in SEQ ID NO: 1， SEQ ID NO: 5， SEQ ID NO: 9， or SEQ ID NO: 13.