CID is a neurological disease believed to be caused
by prions, pathogenic agents that are smaller than
viruses, and are extremely resistant to inactivation
by heat and disinfecting agents. The incubation
period can be many years long and death is almost
certain within a year after initial onset of symptoms. What is the Main Point and What is the sub points?

Main point: CID is a lethal disease caused by prions.

Sub-points:

CID is a neurological disease (this means that it affects the nervous system.)Prions are pathogenic agents (this means disease-causing or harmful) that are smaller than viruses.They are resistant to inactivation by heat and disinfecting agents (this means that they're really hard to kill, because they're technically just misfolded proteins.)The incubation period can be many years long. (as in, symptoms may not show for a long period, but the prions are sitting in your body incubating and biding their time.)There's a very high mortality rate a year after symptoms show.