Step 1: Release a mild but very contagious virus to put the world on a war footing, and to test spread routes and patterns. Begin to alter trade sources and routes, but be sure to blame any disruptions on the virus.

Step 2: Create a political situation to physically, geographically isolate the target enemy.

Step 3: Release a very deadly virus within the target area, using lessons learned from the first virus to contain any that might escape.

*This can only work if the media is obedient and used to control narrative.