Peter joined the school fun run; his desire is to win so he didn’t mind if he was stepping on water wherein his feet was soaked. Even if it feels uncomfortable because his feet is very itchy, he only removed his socks that evening that’s why it was very smelly.
He hanged it at the back of the refrigerator to dry and immediately went to sleep because he was so tired.
Early that morning, his brother John saw the sock hanged at the back of the refrigerator and used it thinking that it was clean.
Which of the following is the role of John in the Chain of Infection?