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Mimiviruses: largest known viruses (even bigger than some single-cell organisms). They are icosahedral and contain a double stranded DNA genome. The capsid is covered by fibres (fibers) that radiate outwards imparting a bacteria-like outer surface to the organism. In fact it takes up the Gram stain (like Gram positive bacteria) causing early confusion. Mimivirus has been implicated in some cases of pneumonia. Originally found in amoeba. See an animation of mimivirus. |