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The 3'- and 5'-terminal nucleotide sequences of the defective interfering (DI) RNAs present in a preparation of DI influenza virus were determined. It was found that all DI RNAs possessed identical terminal sequences for at least the first 13 nucleotides at the 5' end and at least the last 12 nucleotides at the 3' end. The sequence of the DI RNAs is (5')A-G-U-A-G-A-A-A-C-A-A-G-G-...-C-C-U-G-C-U-U-U-C-G-C-U-OH(3'). In addition, the same sequences were present at the 3' and 5' termini of the viral polymerase genes (P1, P2, and P3) from which these DI RNAs originate. These results indicate that DI RNAs of influenzing virus are formed by an internal deletion of the genomic RNA.

Influenza defective interfering viral RNA is formed by internal deletion of genomic RNA.