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A: Once your canned tuna has been opened it must be kept in a refrigerator if you did not eat all of it. If wrapped properly and stored in your fridge it should last for around three days.
Best Answer: That expiration date is meant for the unopened jar. Once open the jar has about 5-7 days and then it needs to be chucked. It isn't worth the risk of food poisoning, over a $3 jar of sauce. Since alfredo sauce has dairy (the cream), I doubt it'll be good past one week once it's opened. Dump the contents and recycle the glass jar.