While Wikipedia's medical content is far from perfect, Google knowledge
graphs however have issues as well.
For example they say that Hepatitis C is MAINLY spread by sexual contact.
This 2010 review in Hepatology states "Regarding heterosexual transmission,
the weight of evidence is that there is no increased risk of sexual
transmission of HCV among heterosexual couples in regular relationships"
WHO says it is a less common method. The main methods of transmission are
injection drug use and unscreened blood transmission.
MD, CCFP-EM, Wikipedian
The Wikipedia Open Textbook of Medicine