From Wikipedia: Tetralogy of Fallot (TOF) is a congenital heart defect which is classically understood to involve four anatomical abnormalities (although only three of them are always present). It is the most common cyanotic heart defect, representing 55-70%, and the most common cause of blue baby syndrome..
Variola (the virus that causes smallpox) is a member of the orthopoxvirus genus, which also includes viruses that cause cowpox, monkeypox, orf, and molluscum contagiosum. Poxviruses are the largest animal viruses, visible with a light microscope.They are larger than some bacteria and contain double-stranded DNA. Poxviruses are the only viruses that do not need a cell's nucleus to replicate inside the cell. The variola virus is the only known cause of smallpox.The disease affects only humans.oxviruses are the only viruses that do not need a cell's nucleus to replicate inside the cell. The variola virus is the only known cause of smallpox. The disease affects only humans.
He took a dairy maid who had cowpox (she had a pustule on her hand), took the â¦ puss and sliced open a little boys arm and infected him with cowpox. Then he put smallpox puss in the cut and the boy didn't get it. in 1796, a man named Edward Jenner said this and everyone thought he was crazy but he was right.e took a dairy maid who had cowpox (she had a pustule on her hand), took the â¦ puss and sliced open a little boys arm and infected him with cowpox. Then he put smallpox puss in the cut and the boy didn't get it. in 1796, a man named Edward Jenner said this and everyone thought he was crazy but he was right.