Can Weird People in Strangerville Travel to Other Worlds?

Istill took my sims to festivals, parties, and Karaoke bars while living in Strangerville and I honestly never saw any sims from there in these places up until my Sim defeated the mother. So I assume infected Sims can't leave Strangerville like we were told. Once you defeat the mother - the illness stops.

I have not tried planting these fruits in other towns. So I have no idea if they can be planted in those worlds or not.