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J Virol. 1971 March; 7(3): 301-308
Copyright © 1971 American Society for Microbiology. All Rights Reserved.

Antigenic and Morphological Similarities of Progressive Pneumonia Virus, a Recently Isolated "Slow Virus" of Sheep, to Visna and Maedi Viruses

K. K. Takemoto, C. F. T. Mattern, L. B. Stone, J. E. Coe and G. Lavelle

1 Laboratory of Viral Diseases and the Rocky Mountain Laboratory, National Institute of Allergy and Infectious Diseases, Bethesda, Maryland 20014

ABSTRACT

Progressive pneumonia virus, the causative agent of a slow, pulmonary disease of Montana sheep, was shown to be antigenically related to two other slow viruses of sheep, visna and maedi. Electron microscopic examination of infected cells revealed that the virus matures by a budding process and that the budding particles as well as the mature, extracellular virions bear striking resemblances to the oncogenic ribonucleic acid (RNA) viruses. Recent findings of an RNA-dependent deoxyribonucleic acid polymerase associated with the virions of this group of slow viruses lend further support to the notion that they may tentatively be classified with the oncogenic RNA tumor viruses.

J Virol. 1971 March; 7(3): 301-308
Copyright © 1971 American Society for Microbiology. All Rights Reserved.



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