Ask The Internets

Hey, Internets? I have a question. I want to make jam-filled sandwich biscuits, but I don't want to make anyone sick. Must I keep the biscuits chilled after filling, or can jam sit at room temperature in once it is spread between biscuits? I was thinking Jammy Dodgers never killed anyone (that I know of), but I don't think that's actual jam in them, at least not before it has been engineered to withstand nuclear apocalypse (yeah, laugh but when nuclear apocalypse comes round you'll want a packet of biscuits). Anyway...what do I need to do to keep the blob of jam in the centre from becoming a bacterial magnet?

Thanks in advance.