My wife has hepatitis B level 573 and is inactive but anti HBS has 9.8 antibodies. So the doctor told me the cause of hepatitis B infection? Did my wife get hepatitis B from me because I also have hepatitis B. What is the treatment?

My sister is currently suffering from chronic active viral hepatitis B. This morning I found out that my sister has been using the wrong toothbrush for 2 days now, but she has gingivitis, so she has scratches. I have had an antibody test before, which is a safe indicator, but I am still afraid of getting infected. The doctor asked me if I have been vaccinated against hepatitis B, is there a high risk of infection? I thank you doctor.