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Who indicated to you or to her that the HCV positive she received on testing could have come from the Cancer treatments, and a weakened immune system? Did doctors describe this scenario to either of you? Did they imply that your fiance only became HCV+ after her Cancer therapy?
We need more detail to the story before making any statements about what has happened, and what the best steps might be.
DoubleDose
Your insights and knowledge/guidance greatly appriciated. Thank you
You both need PCR tests, for that matter, to see what your viral loads are (if any), and whether you both need to consider therapy for HCV. A biopsy for you would also be called for, to assess liver damage, and thus the urgency level for treatment. Your fiance is a different case. If she is newly infected, then regardless of liver damage, she should treat. Of course this is all predicated on her having an actual viral load, and thus infection with HCV, and also, in determining that her infection is recent...and in the 'acute' phase.
By the way there are no shots or vaccines to prevent or deter HCV at all. The only way to deal with preventing HCV is to limit risky behaviors...contact with blood, blood products, IVDU's, transfusions, tattoos, and other contact with other people's blood. This is an odd situation, because sexual, and casual transmission of HCV is very rare according to published studies. If your fiance was negative, and now positive, it is not explained easily by your having the virus.
If she became positive for the virus as a result of her Cancer treatment, it would be something the doctors would need to document. It is not currently believed that HCV can exist undetected and then emerge because of immuno-suppressive therapy. There are some reports of this possibly happening, but most seem unclear. If this really appears to have happened, then it needs to be analyzed and reviewed closely by knowledgable Hepatologists.
Please present this information, and background history to a very experienced Hepatologist, with HCV treatment background. You want to find out what the real history is, for you and your fiance.
Also, HCV genotype testing might tell whether you and your fiance have different infections (different genotypes of HCV), or if you both have the same genotype, you could have POSSIBLY infected her. Were there any blood to blood exchanges, accidents, sexual incidents, etc?
Bottom line, you need to BOTH lay out the cases with a good Hepatologist, have the necessary tests done, and then proceed accordingly.
Keep us informed of what you find out.
DoubleDose
There is no vaccine for hcv. you should be vaccinated for hbv and hav.
Is your fiance's risk for hcv only sexual ? If so, that is unusual, because hcv is rarely transmitted by sex. usually Idu or blood transfusion.
There are some questions about your case which are interesting. Tell your story to a good hepatologist and decide on a course of action.