A complex comprising: a polypeptide shown in or below and a polypeptide shown in or below: a polypeptide which consists of the amino acid sequence shown in SEQ ID NO: 2; or a polypeptide which consists of an amino acid sequence with at least 90% homology to the amino acid sequence shown in SEQ ID NO: 2 and which has the ability to bind with a partial fragment of the influenza virus RNA polymerase PB2 subunit; and a polypeptide which consists of the amino acid sequence shown in SEQ ID NO: 4; or a polypeptide which consists of an amino acid sequence with at least 90% homology to the amino acid sequence shown in SEQ ID NO: 4 and which has the ability to bind with a partial fragment of the influenza virus RNA polymerase PB1 subunit; or a said polypeptide or and a polypeptide shown in or below: a polypeptide which consists of the amino acid sequence shown in SEQ ID NO: 20; or a polypeptide which consists of an amino acid sequence with at least 90% homology to the amino acid sequence shown in SEQ ID NO: 20 and which has the ability to bind with a partial fragment of the influenza virus RNA polymerase PB1 subunit. a polypeptide shown in or below and a polypeptide shown in or below: a polypeptide which consists of the amino acid sequence shown in SEQ ID NO: 2; or a polypeptide which consists of an amino acid sequence with at least 90% homology to the amino acid sequence shown in SEQ ID NO: 2 and which has the ability to bind with a partial fragment of the influenza virus RNA polymerase PB2 subunit; and a polypeptide which consists of the amino acid sequence shown in SEQ ID NO: 4; or a polypeptide which consists of an amino acid sequence with at least 90% homology to the amino acid sequence shown in SEQ ID NO: 4 and which has the ability to bind with a partial fragment of the influenza virus RNA polymerase PB1 subunit; or a polypeptide which consists of the amino acid sequence shown in SEQ ID NO: 2; or a polypeptide which consists of an amino acid sequence with at least 90% homology to the amino acid sequence shown in SEQ ID NO: 2 and which has the ability to bind with a partial fragment of the influenza virus RNA polymerase PB2 subunit; and a polypeptide which consists of the amino acid sequence shown in SEQ ID NO: 4; or a polypeptide which consists of an amino acid sequence with at least 90% homology to the amino acid sequence shown in SEQ ID NO: 4 and which has the ability to bind with a partial fragment of the influenza virus RNA polymerase PB1 subunit; or a said polypeptide or and a polypeptide shown in or below: a polypeptide which consists of the amino acid sequence shown in SEQ ID NO: 20; or a polypeptide which consists of an amino acid sequence with at least 90% homology to the amino acid sequence shown in SEQ ID NO: 20 and which has the ability to bind with a partial fragment of the influenza virus RNA polymerase PB1 subunit. a polypeptide which consists of the amino acid sequence shown in SEQ ID NO: 20; or a polypeptide which consists of an amino acid sequence with at least 90% homology to the amino acid sequence shown in SEQ ID NO: 20 and which has the ability to bind with a partial fragment of the influenza virus RNA polymerase PB1 subunit.