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Introduction. These large viruses cause many diseases which involve erosions/necrotic lesions of the the resp tract, brain, blood vessels, placenta and urinogenital tract eg infectious bovine/feline rhinotrachietis, pseudorabies, equine abortion. Structure Herpesviruses have double stranded DNA enclosed in an icosahedral capsid to a diameter of 100-150 nm. The envelope glycoproteins are the most important vaccinal antigens. |