Transmitted usually by contaminated needles either accidentally (intravenous drug users, shared needles) or in a medical facility. AS of March 2016, direct acting antivirals are available seeing most people living with Hepatitis C cured (with minimal to no side effects) within 8-12 weeks. However, this is a debilitating and potentially fatal disease, if untreated, for which there is no vaccine so it is best as a traveller not to put yourself at risk.
You do this by having the least medical care overseas as possible, so go with your Rabies shots, tetanus already boosted and your malaria pills and do not front up for preventable medical care in developing nations!
If you take medical care for granted overseas, you may come home with AIDS, Hep C or some unknown emerging infection!