In today's world there are virtually millions upon millions of diseases.  Most diseases are caused by viruses or bacteria.  Viruses are considered non-living parasites which enter healthy cells, release their own DNA and cause the healthy cell to begin manufacturing other virus bodies.  Since viruses are not alive, antibiotics cannot kill them; therefore, most viruses have no cure.  When a virus enters the body, antibodies are sent to isolate the virus, then B cells arrive to infiltrate and finally kill the virus.

     Bacteria on the other hand is a living parasite.  It performs the same functions as a virus, but it is considered a living parasite.  Since bacteria is living, antibiotics can be used to kill it.  There are three types of bacteria, bacilla, cocci, and spirili.  Bacilli bacteria are rod shaped and usually appear alone, only occasionally found in groups.  Cocci are spherical bacteria that occur in chains of cells, singularly, or in clusters that resemble a bunch of grapes.  Spirili are spiral shaped bacteria, they are curved, and resemble a comma.  Bacteria is considered deadly due to the fact that it can reproduce very quickly.

     In today’s medical world, most attention has been directed toward deadly viruses that the body cannot kill.  The most deadly virus is known as AIDS, or acquired immune deficiency syndrome.   The aids virus is one of the more peculiar viruses.  It infiltrates the body and conquers the T cells.  When the T cell has been infected, it begins to produce  AIDS cells.  These new AIDS cells then attack all of the remaining B cells until all of the B cells are dead.  With no means of defense, the body then becomes terminally infected and dies.