Question

Look at the diagram showing parts of a typical chain of infection. Which two parts of the chain are missing as indicated by the letters X and Y?
O X: infectious agent; Y: portal of entry
O X: portal of entry; Y: infectious agent
O X: vector; Y: fomite
O X: fomite; Y: vector

Answer 1

Answer:

A. infectious agent and portal of entry

Explanation:

I think this is the answer