Final answer:
The toxin encoded by the virus Corynebacterium diphtheria is called the diphtheria toxin. It blocks host-cell protein synthesis and leads to the formation of a pseudomembrane.
Step-by-step explanation:
The toxin encoded by the virus Corynebacterium diphtheria is called the diphtheria toxin. It is an A-B toxin that blocks host-cell protein synthesis by inactivating elongation factor (EF)-2. The toxin's action leads to the death of the host cells and the formation of a pseudomembrane consisting of dead host cells, pus, red blood cells, fibrin, and infectious bacteria. This pseudomembrane can cover mucous membranes of the nasal cavity, tonsils, pharynx, and larynx.