We had used a sealant around the bottom edge of the toilet.
Sometimes there is a slight odour in the bathroom.
How would I be able to ensure that none of the bodily waste or fluid had somehow escaped from the toilet?
Please look at the edges around the bottom of the toilet bowl.
It most likely is a broken wax seal. That would be my first area to check. You'll have to remove the toilet and replace the wax seal. Do not simply re-use the existing seal, it won't solve the problem. When re-installing the toilet, be careful not the damage the seal, it must remain intact to cover the entire surface of the flange. The caulking around the outside of the toilet is primarily for cosmetic purposes.
I would suggest it could be a dry trap, a dry trap allows sewage gas to come into the room. do you have a floor drain or drain that you haven't used in a while?
Also if it only occasionally, it could be a pressure change outside that is making the venting of the washrooms poor, but that should be all the bathrooms.
If those aren't there, do what has been mentioned that is to lift the toilet and put in new seal. Perhaps a longer thicker one.
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