To be honest even though I know that owning a pet and trips to the vets can be expensive, I wouldn't take the risk of just assuming your cat as got a cold or flu, and using older ointment on it just in case.
Personally I'd be inclined to think of the worst case scenario and I wouldn't want to take the risk because if it's not a cold, then the ointment could potentially make it worse, and I don't think it's worth the risk.
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