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Herpetic ulcerVirus ShapesVaricellaVaricellaIdentify the VirusRNA Oncogenic Viruses.Epstein barr virus pathogenesisHepatitis B virusHepatitis C virusBacterial infections. Bacteria are single-celled organisms with their instructions written on a small piece of DNA. Bacteria are all around us, including inside of our body and on our skin. Many bacteria are harmless or even helpful, but certain bacteria release toxins that can make you sick.