A 36-year-old man is seen for jaundice. He remembers that he…

A 36-year-old man is seen for jaundice. He remembers that he woke up with a fever and abdominal pain 4 days earlier and since then has had no appetite and has felt very tired. His AntiHAV Igm test is positive.  Which of the following is a major mechanism for transmission of this disease?