Finding the child had been a miracle. She was on her own, not a mark on her- but there was about to be. Megatron had been hesitant to touch her due to the irrational thought that even his touch might infect the youngling, but the situation demanded it. She was scooped up off the ground before the creatures got to them, and carried directly to the haven.
Megatron would keep a close watch on the little femme, making sure she got enough fuel, ensuring her bill of health was spotless. No youngling deserved to be subjected to this Hell, but he’d be damned if he didn’t at least make it safe as possible for her.
He would do everything in his power to hide his infection from her, for as long as possible.