If you don’t know cannot pinpoint a specific incident there is no way to know when you were infected.
However, blood transfusions done prior to 1990 when antibody testing was developed to detect hep c allowing the blood supply to be secured was a known risk so if you have no other risk factors that could be a likely source.
In any event no there is no way to determine and you will never know but it is highly probable that was the source of your hep c infection.
There are many long term monogamous couples where one has hepatitis C and the other does not. In fact the CDC does not recommend that such couples use barrier protection i.e. condoms. Hep c is not really considered to be an STD. While sexual transmission is possible that is more common for those who have multiple partners or engage in rough sexual practices.
About 20% of those infected for more than 20 years will develop advanced liver scarring meaning 80% do not. Fo myself I learned I had hep c when I donated blood about 20 years after I suspect I was infected. My fibrosis score on liver biopsy at that time was F1 or minimal scarring. I was followed over the years of infection having biopsies every five years going from F1 to F2 to F3 and finally F4 which is by definition liver cirrhosis but that was after being infected for 30 years. I was diagnosed with liver cirrhosis in January 2008.
I treated with the old interferon based treatments three times in the past but had no response to treatment. I was finally cured of hep c after completing treatment with 24 weeks of Harvoni and ribavirin in May 2015. My treatment was longer than normal due to my prior history of multiple treatment failures and having cirrhosis.
So you likely have had hep c since the blood transfusions. It is not unusual for one spouse to have hep c and the other one does not. Most people don’t develop significant liver damage until they have been infected for decades.
Hand in there you will learn more soon. I know this is a scary time for you but odds are extremely good you will be cured with a treatment that is very effective and well tolerated by most patients. And the odds are good you have little to no liver damage. Also for those with less liver damage after cure they can return to normal life as if never infected. For myself I see my hepatologist every year and have blood testing and abdominal ultrasound every six months.
Also there are less invasive methods other than liver biopsy to estimate liver scarring. There is a machine called a Fibroscan and a blood test called fibrosure both are reasonable accurate at estimating liver damage.
Let me know if you have any more questions I’ll try to help as best I can.
Good luck with your doctors appointment and treatment.
Not familiar with genotype 1b being more aggressive in terms of liver scarring.
Fatty liver is a growing problem in the US as a cause of liver damage. Hep c is often associated with fatty liver but having fatty liver all in its own can cause liver damage.
There is a condition called NAFLD non alcohol fatty liver disease. As there is an increase in obesity in the US there is an associated rise in liver disease caused by being over weight. If your BMI is above 30 (obese) the single best thing you can do is lose some weight preferable to get to a normal BMI of less than 25 or at least get into overweight range of less than 30.
I personally think in my lay persons opinion that since having hep c can take decades to cause liver damage it would likely be similar in fatty liver. But having both hep c and fatty liver could be a sort of one-two punch against your liver.
Still if you do have significant liver damage with cure of hep c you can still live a normal life span and die from something other than liver disease.
As I said I’ve been living with liver cirrhosis for over 11 years. Now that I'm cured my prognosis is greatly improved
Best of luck
Sorry to hear about the F4 score.
I had no symptoms cirrhosis is a silent illness.
My first noticeable symptom was lower leg and foot swelling called putting edema. Also I developed a low platelet of around 80 to 90 with min normal being 150. Both are common first symptoms of early cirrhosis.
Four years after I was diagnosed on my 3rd upper endoscopy I was found to have grade3 esophageal varicies that needed banding. And of course easy bruising.
I never did drugs but had several surgeries before 1980. The doctor agreed that at that time, there were no definitive tests to find Hep C in the blood, so I got it from a blood transfusion.