ECHOViruses Reoviruses - download pdf or read online

By H. A. Wenner, A. M. Behbehani, L. Rosen (auth.)

Reoviruses are ether-resistant icosahedral viruses 60 to seventy five mp in diameter which comprise ribonucleic acid. they've been recovered from guy and reduce animals and are ubiquitous of their geographic distribution. at the present, the significance of those viruses as a explanation for human or animal sickness continues to be mostly unknown. because of having a few strange features, reoviruses have attracted the eye of many employees within the fairly couple of minutes on account that they have been first famous. for instance, investigators drawn to the molecular facets of virology were attracted by means of the bizarre double-helical ribonucleic acid of excessive molecular weight which reoviruses own, whereas these attracted to epidemiology were attracted by means of the prevalence of it sounds as if exact viruses in either guy and an strangely wide array of decrease animals. This com­ pilation relies on details to be had to the writer as of October 31, 1966. II. historical past The time period "reqvirus" used to be proposed in 1959 (SABIN, 1959) as a gaggle identify for a couple of viruses then categorized (SABIN, 1956; RAMOS-ALvAREz and SABIN, 1958) as being exact with, or on the topic of, ECHO variety lO virus.

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Of the 31 serotypes 13 have been associated with rashes. Types 9 and 16 have an unmistakable association with disease; types 2,4,6, and 11, and perhaps others listed in Table 4 probably involve the skin in expression of clinical pathology. , 1963). To provide a reader with the protean features of the clinical response a SUIDmary of the cutaneous eruptions associated with types 4, 9, and 16 follows: EOHO 4: JOHNSSON et aI. (1958a) described a fine blotchy efflorescence localized to the face, and less often to trunk, arms and legs, usually appearing during the first and third days of illness, but occasionally developing during the second bout of a biphasic febrile course.

In cross-tests using antisera prepared in rabbits against these and other strains, there was such a great intratypic variation in titer ratios that classification of strains would be exceedingly difficult (BARRON and KARZON, 1961). The Dutoit strain isolated in S. , 1960). Just why Dutoit should be better than many others for detection of antibodies in tube tests is not fully understood. , 1963). With Dutoit, an increase in cytoplasmic RNA was detectable two hours earlier than with Pesascek. The buoyant density of both viruses in cesium chloride was 1: 35; viral particles of both were morphologically identical by electron microscopy.

1964). B. ntigenic Variations 1. Type Specific Antisera The identity of enterovirus serotypes is based on their serological specificities. Following naturally-occurring infections with specific serotypes, or after inoculation of the serotypes into animals, specific humoral antibodies develop. The major difficulty encountered with human sera relates not to their specificity, but often to their cross-reactivity with other serotypes. On the other hand,animalsinoc~lated with purified virus stocks provide type-specific antisera, not only useful for Antigenic Characteristics 31 both within and between serotypes.

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