Viruses have been variously defined as any of the large group of submicroscopic infective agents that are regarded either as extremely simple microorganisms, or as extremely complex molecules, that typically contain a protein coat surrounding an RNA or DNA core of genetic materials, but no semi-permeable membrane. They are capable of growth and multiplication only in living cells, and they cause various important diseases in man, lower animals and plants. Roger, defined viruses as obligate parasites; the infectious units comprise either RNA or DNA enclosed also have lipids in their coat. Reaction of the host is usually their only perceptible and variable effect, and even that may be lacking or invisible, as in much latent virus infection.
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Citation: Daudu OAY, Yusuf L, Abejide DR, Busari J, Adeniyi K (2013) Preliminary Studies on Two Viruses Infecting Two Wild Plants: Talinum triangulare (Jacq) Willd and Desmodium tortuosum (SW) DC in Samaru, Zaria, Kaduna State. J Plant Pathol Microb 4:178
Last date updated on July, 2014