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Generally speaking, food-borne illnesses are transmitted via fecal contamination of uncooked food products. However, if you are handling raw chicken and then you touch an apple, you can contaminate the apple with your hands. In this instance, the hands are the "method of transfer" but the initial pathogen on the raw chicken was most likely placed there by some fecal contamination.
A general rule of thumb when dealing with any infection is that where ever the pathogen has caused infection is the same place where transmission needs to occur. The flu infects the nasal passages and is transmitted by nasal secretions of one person coming into contact with nasal secretions of another person. Salmonella infects the intestines and is transmitted by poop getting into someone's mouth. Yum. HIV infects the bloodstream and is transmitted by exchanging internal bodily fluids. Certainly there are exceptions to this rule, but it's a decent rule if you're trying to figure out how something is passed from one person to another.
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