Adenoviruses - A number of different types of adenoviruses have been isolated from a wide variety of species. They generally show the same basic structure. They cause respiratory disease in birds and mammals, and are also implicated in the production of tumours. Adenoviruses are large (80 nm) icosahedral viruses which contain dsDNA. The capsid is composed of 252 roughly spherical morphological subunits arranged on a T=2S lattice.
The morphological units of the, icosahedron faces (hexons, 240) are antigenically distinct from the morphological units at the vertices (pentons, 12). From 12 points of the five-fold, symmetry at the capsid surface extend spike like structures
