Viral Structure, Classification, and Replication

Chapter 18


Viral Structure, Classification, and Replication




Structure and Classification of Viruses







1. DNA genome (Fig. 18-1A)





2. RNA genome (Fig. 18-1B)




3. Segmented genome



Viral capsid (Fig. 18-3)




• In viruses that lack an outer envelope, the capsid enclosing the genome forms the outer layer of the virion.


1. Shape



2. Formation



3. Capsid components recognize and bind to cell surface receptors on host cells.



Viral envelope



• Important differences between nonenveloped and enveloped viruses are summarized in Table 18-1.



TABLE 18-1


Nonenveloped (Naked) Versus Enveloped Viruses











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Jun 18, 2016 | Posted by in IMMUNOLOGY | Comments Off on Viral Structure, Classification, and Replication

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Property Nonenveloped Viruses Enveloped Viruses
Components Proteins Phospholipids, proteins, glycoproteins