UNSPECIFIED. (2006) In vivo antiviral activity: defective interfering virus protects better against virulent Influenza A virus than avirulent virus. JOURNAL OF GENERAL VIROLOGY, 87 (Part 5). pp. 1259-1265. ISSN 0022-1317

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Abstract

A defective interfering (DI) virus differs from the infectious virus from which it originated in having at least one major deletion in its genome. Such DI genomes are replicated only in cells infected in trans with homologous infectious virus and, as their name implies, they interfere with infectious virus replication and reduce the yield of progeny virus. This potent antiviral activity has been abundantly demonstrated in cell culture with many different DI animal viruses, but few in vivo examples have been reported, with the notable exception of DI Influenza A virus. A clue to this general lack of success arose recently when an anomaly was discovered in which DI Influenza A virus solidly protected mice from lethal disease caused by A/PR/8/34 (H1N1) and A/WSN/40 (H1N1) viruses, but protected only marginally from disease caused by A/Japan/305/57 (A/Jap,H2N2). The problem was not any incompatibility between the DI and infectious genomes, as A/Jap replicated the DI RNA in vivo. However, A/Jap required 300-fold more mouse infectious units to cause clinical disease than A/PR8 and it was hypothesized that it was this excess of infectivity that abrogated the protective activity of the DI virus. This conclusion was verified by varying the proportions of DI and challenge virus and showing that increasing the DI virus: infectious virus ratio in infected mice resulted in interference. Thus, counter-intuitively, DI virus is most effective against viruses that cause disease with low numbers of particles, i.e. virulent viruses.

Item Type:	Journal Article
Subjects:	T Technology > TP Chemical technology Q Science > QR Microbiology > QR355 Virology
Journal or Publication Title:	JOURNAL OF GENERAL VIROLOGY
Publisher:	SOC GENERAL MICROBIOLOGY
ISSN:	0022-1317
Date:	May 2006
Volume:	87
Number:	Part 5
Number of Pages:	7
Page Range:	pp. 1259-1265
Identification Number:	10.1099/vir.0.81678-0
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/33609

Data sourced from Thomson Reuters' Web of Knowledge

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