1. 
   Cross protection
   The phenomenon in which plant tissues infected with one strain of a virus are protected from infection by other strains of the same virus.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   cross-protection
   The protection conferred on a host by infection with one strain of a virus that prevents infection by a closely-related strain.
   Found op http://ppathw3.cals.cornell.edu/glossary/Defs_C.htm
   
   

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