Autobot plague victims
From MediaWiki

The Autobot plauge victims were victims of the ancient Cybonic plauge.
Fiction
Optimus and Ratchet went to investigate an Autobot distress signal. They find a centuries old crashed ship and enter hoping to find survivors. They found multiple dead bodies. After scanning the bodies, Ratchet concluded that they didn't die in the crash but from an ancient virus known as the Cybonic plague. The ship moves and one of the victims' bodies, which hung from the ceiling, dripped infected energon. The energon fell into the eye of Optimus Prime causing him to be infected.

