Equine herpesviruses: antigenic relationships and deoxyribonucleic acid densities.
Abstract: Equine herpesviruses with a deoxyribonucleic acid density of 1.716 to 1.717 g/cm(3) were compared with one another by the plaque-reduction test and by the rate of development of cytopathic effect as indicated by plaque size in rabbit kidney cultures. Of the 19 isolates studied, the 9 which had already been tentatively labeled equine abortion viruses were serologically similar to one another; each of them grew more quickly than did any of the other 10 isolates although the mean plaque sizes formed a series of gradations with no clear hiatus which would permit the unequivocal delineation of the abortion viruses from the slowly growing strains. The 10 slowly growing isolates showed antigenic heterogeneity even though complement was present; the neutralizing capacity of an antiserum against the heterologous strains was, in most instances, markedly less than against the homologous strains, the range of the 50% endpoints being much greater than that observed among the equine abortion viruses, or among isolates of herpes simplex type 1. There was no cross neutralization between the equine abortion viruses and any of the 10 slowly growing isolates. An extra band of deoxyribonucleic acid, at 1.723 to 1.725 g/cm(3), was present in two of the slowly growing strains when originally grown in rabbit cells, but was no longer present after passage in cat cells. This band occupied the same position as one reported in the hamster-passaged strain of equine abortion virus, and had a density similar to that of the equine genital herpesvirus. Although the taxonomic demarcation of the equine abortion viruses and the slowly growing herpesviruses from one another is still open to question, they can be conveniently labeled equine herpesviruses 1 and 2, respectively; the genital virus would be termed equine herpesvirus 3.
Publication Date: 1973-10-01 PubMed ID: 4742974PubMed Central: PMC422900DOI: 10.1128/iai.8.4.621-627.1973Google Scholar: Lookup
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- Journal Article
Summary
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The researchers compared characteristics of equine herpesviruses and found variations among different strains, leading them to propose a provisional labelling system.
Overview of the Study
- The researchers compared equine herpesviruses with deoxyribonucleic acid (DNA) density of 1.716 to 1.717 g/cm(3). Comparison methods included the plaque-reduction test and the rate of development of cytopathic effect as indicated by plaque size in rabbit kidney cultures.
- A total of 19 isolates were studied, of which 9 had been tentatively labeled as equine abortion viruses.
Findings
- The equine abortion viruses grew more quickly than the other 10 isolates, and though there were gradations in mean plaque sizes, there was no clear delineation to unequivocally identify these viruses based on plaque sizes.
- Among the 10 slower-growing isolates, there was an observed antigenic heterogeneity even when complement was present. However, the neutralizing capacity of antiserum was markedly reduced against heterologous (differing in characteristics) strains compared to homologous strains.
- There was no cross neutralization observed between the equine abortion viruses and any of the slowly growing isolates indicating a strong distinguishing feature between these groups.
Notable Observations
- An extra band of DNA, was noted in two of the slowly growing strains when originally grown in rabbit cells, but it disappeared after passage in cat cells. This band’s density was similar to the equine genital herpesvirus density and occupied the same position as the one reported in the hamster-passaged strain of equine abortion virus.
- Despite these observations, the differentiation between equine abortion viruses and slowly growing herpesviruses remained uncertain, leading the researchers to suggest a temporary naming convention.
Suggested Naming Convention
- The researchers proposed that the equine abortion viruses can be conveniently labeled as equine herpesviruses 1 and the slower growing herpesviruses as equine herpesviruses 2. They suggested the genital virus be referred to as equine herpesvirus 3.
Cite This Article
APA
Plummer G, Goodheart CR, Studdert MJ.
(1973).
Equine herpesviruses: antigenic relationships and deoxyribonucleic acid densities.
Infect Immun, 8(4), 621-627.
https://doi.org/10.1128/iai.8.4.621-627.1973 Publication
Researcher Affiliations
MeSH Terms
- Animals
- Antigens, Viral / analysis
- Cytopathogenic Effect, Viral
- DNA, Viral / analysis
- Densitometry
- Herpesviridae / immunology
- Horses / immunology
- Immune Sera
- Kidney / microbiology
- Neutralization Tests
- Rabbits / immunology
- Viral Plaque Assay
- Virus Cultivation
References
This article includes 21 references
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Citations
This article has been cited 15 times.- Badr C, Souiai O, Arbi M, El Behi I, Essaied MS, Khosrof I, Benkahla A, Chabchoub A, Ghram A. Epidemiological and Phylogeographic Study of Equid Herpesviruses in Tunisia. Pathogens 2022 Sep 5;11(9).
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- Anis E, Ilha MRS, Engiles JB, Wilkes RP. Evaluation of targeted next-generation sequencing for detection of equine pathogens in clinical samples. J Vet Diagn Invest 2021 Mar;33(2):227-234.
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