Hi . We are not medical experts, but, generally, researchers say it takes at least two weeks for any symptoms to appear after infection. If you don't mind me asking, what makes you suspect you had a cross infection? I would strongly suggest you get tested, regardless. If you don't, you will always wonder. Testing will either bring you peace of mind or lead to immediate treatment, which can cure you before any damage occurs. Keep us posted if you are comfortable. Thinking of you. - Lori (Team Member)