•Can affect both vertebrates and invertebrate animals.
Structure
-Has an enveloped virus particle
-Generally shaped as an oval or brick
-Virion has a diameter of 200 nm and length of 300 nm
-Genome is carried in single stranded (ss) linear DNA.
Smallpox Virus
•Cure invented by Edward Jenner
•Found out that cowpox is the vaccination to small pox.
•Tested by pricking a boy with milkmaid affected by cowpox virus and exposing him to smallpox virus.
•Amazingly few scares were seen and he recovered quickly.
•It is the largest virus cell and it can be seen through a light microscope.
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