ENZYMATIC ENHANCEMENT OF INFECTIVITY OF REOVIRUS

Spendlove, R. S. (California State Department of Public Health, Berkeley), and F. L. Schaffer. Enzymatic enhancement of infectivity of reovirus. J. Bacteriol. 89:597-602. 1965.-Enhancement of infectivity by chymotrypsin treatment has been demonstrated with all three types of reovirus, although not in all viral preparations. Enzyme treatment did not produce a simultaneous increase in the hemagglutinating activity of reovirus type 1 (the only type tested). The infectivity of reovirus type 1 (Lang strain) was increased by treatment with chymotrypsin, trypsin, papain, and a filtrate from a culture of a Pseudomonas sp. but not by treatment with pepsin. Sedimentation experiments showed that the property of enhanceability was closely associated with the virus particles themselves. Results of studies involving various sequential treatments with chymotrypsin, and with heat in the presence or absence of 2 m MgCl(2), were compatible with the interpretation that inhibited virus is resistant to exposure to a temperature of 56 C in the absence of MgCl(2), whereas activated virus is thermolabile. Activation of reovirus infectivity by heat in the presence of MgCl(2) and by chymotrypsin was not additive.

FINE STRUCTURE OF REOVIRUS TYPE 2

Loh, Philip C. (University of Hawaii, Honolulu), H. R. Hohl, and M. Soergel. Fine structure of reovirus type 2. J. Bacteriol. 89:1140-1144. 1965.-The fine structure reovirus type 2 was studied by electron microscopy with the negative-staining method. The virus has a mean diameter of 772 A and shows evidence of icosahedral shape and 5:3:2 symmetry. The particle is composed of a core, an inner layer, and a capsid composed of 92 elongated hollow capsomeres. These capsomeres have mean dimensions of 116 A x 110 A and a central hole 48 A in diameter. In size and architecture, reovirus type 2 is very similar to the other members (reoviruses types 1 and 3) of this group of animal viruses.

REOVIRUS ENCEPHALITIS IN NEWBORN MICE: AN ELECTRON MICROSCOPIC AND VIRUS ASSAY STUDY

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PATHOLOGY OF INFECTION WITH TYPES 1 AND 2

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THE CHRONIC DISEASE FOLLOWING REOVIRUS TYPE 3 INFECTION

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PATHOLOGY OF THE ACUTE PHASE

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