Infection with strains of Citrus tristeza virus does not exclude superinfection by other strains of the virus.

Journal of Virology
Svetlana Y FolimonovaWilliam O Dawson

Abstract

Superinfection exclusion or homologous interference, a phenomenon in which a primary viral infection prevents a secondary infection with the same or closely related virus, has been observed commonly for viruses in various systems, including viruses of bacteria, plants, and animals. With plant viruses, homologous interference initially was used as a test of virus relatedness to define whether two virus isolates were "strains" of the same virus or represented different viruses, and subsequently purposeful infection with a mild isolate was implemented as a protective measure against isolates of the virus causing severe disease. In this study we examined superinfection exclusion of Citrus tristeza virus (CTV), a positive-sense RNA closterovirus. Thirteen naturally occurring isolates of CTV representing five different virus strains and a set of isolates originated from virus constructs engineered based on an infectious cDNA clone of T36 isolate of CTV, including hybrids containing sequences from different isolates, were examined for their ability to prevent superinfection by another isolate of the virus. We show that superinfection exclusion occurred only between isolates of the same strain and not between isolates of different stra...Continue Reading

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Citations

Oct 24, 2008·Phytopathology·L StavoloneJ F Laliberté
May 21, 2013·Annual Review of Phytopathology·William O Dawson, Svetlana Y Folimonova
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