Which of the Following Statements About Pathogens Is Incorrect

Which of the following statements about pathogens is incorrect?

A) A pathogen causes the immune system to mount a defensive mechanism or disrupts a vital body process.
B) When a microorganism is transmitted from an animal host to a human host it becomes a harmful pathogen.
C) Transmission of an infectious disease does not have to have direct human contact.
D) When a pathogen enters the new host, it may not actually cause an infection.
E) Once the final stage of recovery has occurred, the body has built a permanent immunity to that pathogen.