What is the second link in the chain of transmission?

a) infectious agent

b) portal of entry

c) portal of exit

d) eservoirs

The chain of infection, if we think of it as an actualchain, is made up of six different links: pathogen (infectious agent), reservoir, portal of exit, means oftransmission, portal of entry, and the new host. Eachlink has a unique role in the chain, and each can be interrupted, or broken, through various means.