PART III: EXPANSION
"The Planet tried to persuade the Cetra to leave the Knowlespole, but…"
Ifalna, Final Fantasy VII Original Game
~.~
"The Cetra were attacked by the virus and went mad…transforming into monsters."
Ifalna, Final Fantasy VII Original Game
~.~
"Then, just as it had at the Knowlespole. It approached other Cetra clans…and infected them with…the virus."
Ifalna, Final Fantasy VII Original Game
~.~
To cause disease, a pathogen must successfully achieve four steps or stages of pathogenesis: exposure (contact), adhesion (colonization), invasion, and infection. The pathogen must be able to gain entry to the host, travel to the location where it can establish an infection, evade or overcome the host's immune response, and cause damage (i.e., disease) to the host. In many cases, the cycle is completed when the pathogen exits the host and is transmitted to a new host.
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