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The Adenovirus is a medium sized virus, approximately 90 to 100 nanometers in size. It is non-enveloped, in the sense that its structural chemistry does not posses an outer shell, and it is icosahedral, which is basically just a special word defining the shape of its molecule.
The Adenovirus is composed of a nucleocapsid and a double stranded linear DNA genome. The Adenovirus is the largest non-enveloped virus, carrying about 22-40 genes in its double stranded DNA sequence.
Responsible for about 5-10% of all upper respiratory infections in children and some occasional infections in adults as well, this particular virus is primarily spread via respiratory droplets as it has a very prolonged life outside of the body. Occasionally, it can also be spread via fecal routes as well.
Below is an electron tunneling picture of the human adenovirus.