thank you and god bless u all
You can not give something, you don't have. You can not pick infection from an infection free partner. When PCR and ELISA of your girl friend came "negative" then why you worry? You are safe if you do not have other "endeavors" on your credit.
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Your doctor is correct. You are negative and don't need further testing. The tests don't look for strains, they look for antibodies or antigens.