what is a pathogen?

what are the 4 things a pathogen must do?

when does infection occur?

when does disease occur?

what is it called when a pathogen is transferred from one individual to another?

how do pathogens get into the body?

what are two common points of entry for a pathogen?

what can be caused by pathogens entering the gas exchange system?

what diseases can be caused by pathogens entering the digestive system?

what are three of the bodies natural defences?

what are the two main ways a pathogen affects the body?

what is an example of a pathogen damaging host tissue?

what determines how quickly a pathogen causes damage?