Sexually transmitted diseases or infections

If you have been checked for sexually transmitted infections and you are all clear, and then you have sex with someone who is also clear of any sti, is it possible to give them an sti? Also, if you do have an sti and treat it.. after you have been treated, if you have sex with someone who is all clear can you still pass on an sti? Thanks, I appreciate any responses just to clear it up. Posted from TSR Mobile

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