I just got over a terrible cold myself, so I understand how your kitties feel! It can be brought in that same way as a human cold (they are both viruses), so it's possible you brought it in the house on you, if you visited a shelter, or touched any outside cats, it could have come in on your hands or clothes. Or it could have come from the new cat, I recall you saying that your cats have gone in the bathroom with her and you "shooed" them out. URI can be airborne, and the symptoms can vary from cat to cat, so she may not have looked sick, but still have it (and that would explain her lack of appetite too).
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