Abstract
Calicivirus particles isolated from rabbits suffering from acute RHD were compared with virions found in rabbits with chronic disease. Liver homogenates of rabbits with the protracted disease display no hemagglutinating activity and contain viral particles with diameters of 25–27 nm. These virions contain only one structural protein of 30 kDa and are distinctly smaller than intact rabbit hemorrhagic disease virus (RHDV) 32–40 nm). To prove the RHDV identity of the smaller virions, their reactivity with RHDV specific antibodies was investigated by immunoblots of the virion protein and by immunoelectron microscopy. Proteolytic digestion of RHDV particles with α-chymotrypsin did not transform RHDV into the smaller form. We assume that these core-like particles (CLPs) are not a result of proteolytic digestion but arise from a truncated RHDV genome or defective expression.
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