Human herpesviruses 1, 2, and 3 (herpes simplex virus 1 (HSV-1), herpes simplex virus 2 (HSV-2), and varicella-zoster virus (VZV)) have been classified as alphaherpesviruses based originally upon their biological properties, and subsequently on the sequences of their respective genomes (Minson et al., ; Pellett and Roizman, in press). All of these viruses maintain latent infections in sensory ganglia, and can productively infect a variety of human cells, including the living cells of mucous membranes and skin. These epithelial sites also provide exit points for the virus to infect other individuals.
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