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• W2062423255 abstract "The contributions of type I interferons (IFNs) to the in vitro attenuation of three temperature-sensitive (Ts) subgroup A and one subgroup B deletion mutant RSV strains were evaluated. The ability of these vaccine viruses to induce IFNs at their permissive and restrictive temperatures and their sensitivity to the antiviral effects of exogenous I IFNs were tested in human lung epithelial A549 cells. Our results show that the highly attenuated and immunogenic subgroup A vaccine strain Ts1C produced higher levels of IFN-β than its parent RSS-2 or two related strains, Ts1A and Ts1B, at their permissive temperature. Growth of RSV-infected A549 cultures at restrictive temperatures or prior UV inactivation of the virus abolished the observed induction of IFN-β, suggesting a strict requirement of viral replication for cellular IFN induction. The enhanced induction of IFN-β by the highly immunogenic Ts1C at permissive temperature may be an advantageous characteristic of a live intranasal vaccine candidate. The subgroup B strain RSV B1 and its mutant cp-52 (with SH and G gene deletions) both induced similar but low levels of IFN-β. Hence the observed overattenuation of cp-52 in human infants is probably not due to enhanced IFN induction during its replication in the host. The ability of cp-52 , which does not express the SH and G proteins, to induce IFN-β levels similar to those of its parent strain suggests that these viral proteins may not have a role in the induction of IFN-β in the host. In addition, both subgroup A and B mutants and their respective parent strains were similarly resistant to the antiviral effects of exogenous IFN-α or -β. Therefore, increased sensitivity of the mutants to IFNs does not seem to contribute to their attenuation." @default.
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• W2062423255 date "2000-06-01" @default.
• W2062423255 modified "2023-09-28" @default.
• W2062423255 title "Role of Type I IFNs in the in Vitro Attenuation of Live, Temperature-Sensitive Vaccine Strains of Human Respiratory Syncytial Virus" @default.
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• W2062423255 doi "https://doi.org/10.1006/viro.2000.0290" @default.
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