The sign for Ebola Virus uses a palm down "S" hand and throws it
forward while changing it into a palm-down 3 hand.
Source: Ayiu John Wuol
https://www.youtube.com/watch?v=hQdR1sFbVHw
You can learn American Sign Language (ASL) online at American Sign Language University ™
ASL resources by Lifeprint.com © Dr. William Vicars