Previous calicivirus reverse-genetics systems have relied on the transfection of either in vitro-transcribed, 5′-capped calicivirus genomic RNA (Chang et al., 2005; Sosnovtsev & Green, 1995) or cDNA constructs, followed by delivery of T7 RNA polymerase using a VACV recombinant (Sosnovtsev et al., 2002; Thumfart & Meyers, 2002). A recent report on rabbit hemorrhagic disease virus (RHDV) has also demonstrated that in vitro-transcribed, uncapped RNA is infectious when transfected into cells or delivered directly to the liver in vivo (Liu et al., 2006). Attempts to recover MNV by using any of these established approaches failed to produce infectious virus (data not shown).
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