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.
1 [anno: The smallpox virus normally enters the body through the respiratory system. 2  Smallpox can cause millions of cells within the body to explode. 3  If too many cells explode, entire organs could fail, and a person could die. 4  Smallpox also lives on in the blood after a person has died.mallpox is spread when a person breathes it inâ¦and out. The virus gets inside the cells lining the throat and hijacks the cellular machinery to make millions more smallpox viruses. The cells explode, releasing smallpox âbombs.â Those virus particles go on to infect other cells in the body.