Infection is spread through sharing objects which have been in contact with blood even in invisible and minute quantities:
Drug paraphernalia such as syringes, filters, spoons, crack pipes, straws etc and more rarely supplies for piercing and tattooing, scarification or shaving.
This form of hepatitis is also common among people who had blood transfusions before 1991 and those who underwent invasive medical tests (when an instrument is put inside the body) especially before 1997.
Hepatitis C can also be spread during unsafe sex if blood is present even in minute amounts (menstrual blood, unprotected anal intercourse, some sadomasochistic practices etc).
It is a chronic disease which can be life threatening.
There is no vaccine against hepatitis C.
However there is treatment. It is restrictive but can in some cases cure the illness.
Talk to your doctor about it.