I think it could be caused by the odor transfer from your co-worker.
I would clean, clean, clean the area with a product called OdorXit. You can get it online, and in some retail shops here in the US. Use it exactly how directed. I would also super up my cleaning of the litter boxes. I would make sure I have given my cats NO reason not to use the boxes. I would make sure I haven't changed litter lately, and if I did, I would change back pronto.
A lot of people on here will tell you to go get your kitties medically checked out. I don't think that is really necessary 95% of the time.
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