Reticulose

A viral disease (or viral infection) occurs when an organism's body is invaded by pathogenic viruses, and infectious virus particles (virions) attach to and enter susceptible cells.[1] Contents 1 Structural characteristics 1.1 Pragmatic rules 1.2 Baltimore group 1.3 Clinical characteristics 2 See also 3 References 4 External links Structural characteristics Virions of some of the most common human viruses with their relative size. Nucleic acids are not to scale. SA... [wikipedia]