Those who swallow a piece of Mnggal-Mnggal suffer extreme pain from
the internal assault. Their strength and stamina plummet, and they register
Mnggal-Mnggal's sinister intelligence, fully aware of what is happening to
them. Any substance that induces vomiting can cause the victim to expel
the Mnggal-Mnggal seed, but only within the first 12 hours after infection.
...
A more subtle assault can result from the ingestion of a small piece of
Mnggal-Mnggal. This fate might befall a GM character traveling aboard
the heroes’ ship. If the condition goes untreated, the victim will transform
into a zombie at the worst possible moment, such as in the middle of
hyperspace navigation, a tricky asteroid transit, or an intense exchange of
space dogfighting.
-Star Wars RPG: The Unknown Regions, Chapter IV: Hazards