1887

Abstract

We have previously obtained four transfectant influenza A viruses containing neuraminidase (NA) genes with mutated base pairs in the conserved double-stranded RNA region of the viral promoter by using a ribonucleoprotein transfection system. Two mutant viruses (D2 and D1/2) which share a C-G→A-U mutation at positions 11 and 12 of the 3′ and 5′ ends, respectively, of the NA gene, showed an approximate 10-fold reduction of NA-specific mRNA and protein levels (Fodor 72, 6283–6290, 1998). These viruses have now allowed us to determine the effects of decreased NA levels on virus pathogenicity. Both D2 and D1/2 viruses were highly attenuated in mice, and their replication in mouse lungs was highly compromised as compared with wild-type influenza A/WSN/33 virus. The results highlight the importance of the level of NA activity in the biological cycle and virulence of influenza viruses. Importantly, mice immunized by a single intranasal administration of 10 infectious units of D2 or D1/2 viruses were protected against challenge with a lethal dose of wild-type influenza virus. Attenuation of influenza viruses by mutations resulting in the decreased expression of a viral protein represents a novel strategy which could be considered for the generation of live attenuated influenza virus vaccines.

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2000-03-01
2019-12-12
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