Contagion (CYOAH! Redux)

You launch a deadly virus that slowly goes widespread across the planet, killing millions of humans. However, even though 600,000,000 humans have been exterminated, this is not enough to kill all of them, but it does severely weaken many of their nations, such as countries in the continent of Africa, causing unrest, riots, and even rebellions. The virus still roams on, spreading panic wherever it strikes, and leaving death and destruction in its path. The nations of Earth begin to cooperate to try and develop a vaccine to stop your virus. You will either:

Invade Earth before they can recover ,

Send in agents to stop the vaccination, or

Wait it out and see what happens