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Journal of General Virology (2000), 81, 2755-2762.
© 2000 Society for General Microbiology

Animal: RNA Viruses

Quantitative analysis of viral RNA kinetics in coxsackievirus B3-induced murine myocarditis: biphasic pattern of clearance following acute infection, with persistence of residual viral RNA throughout and beyond the inflammatory phase of disease

K. Nundita Reetoo1, Shabina A. Osman1, Shirin J. Illavia1, Charlotte L. Cameron-Wilson1, Jangu E. Banatvala1 and Peter Muir1

Department of Infection, Guy’s, King’s & St Thomas’ School of Medicine, King’s College London, St Thomas’ Campus, Lambeth Palace Road, London SE1 7EH, UK1

Author for correspondence: Peter Muir. Fax +44 20 7922 8387. e-mail peter.muir{at}kcl.ac.uk

Although the association remains controversial, enteroviruses have been implicated in the aetiology of several chronic diseases of humans. To further understand the mechanism of enterovirus persistence and its relationship to organ pathology, virus infectivity and viral RNA kinetics in the heart and other target organs during acute and persistent phases of murine coxsackievirus B3 infection were investigated. These studies revealed a biphasic pattern of virus clearance. Thus, there was a rapid but incomplete clearance of viral RNA from the myocardium following the acute phase of virus replication, which paralleled the elimination of virus infectivity. The mean half-life of viral RNA between days 5 and 14 post-infection (p.i.) was 13·4 h. In contrast, a much slower rate of decline in viral RNA levels was observed during the post-infectious inflammatory phase of myocarditis. The mean half-life of viral RNA between days 14 and 90 p.i. was 14·1 days. Viral RNA persisted in the myocardium beyond the resolution of inflammation and was still detectable in a proportion of animals 90 days after infection. Clearance of viral RNA from other target organs occurred more rapidly, but the rate of clearance was largely independent of the level of viral RNA present during the acute phase of infection. Thus, while antiviral immune responses effectively eliminated infectious virus, clearance of residual viral RNA from the myocardium and other target organs was significantly delayed, despite a prolonged inflammatory response. These findings suggest that clearance of persistent enterovirus infection requires mechanisms different from those responsible for the elimination of virus infectivity.




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