Answer :
All of the choices are the characteristics of a pathogen that determine its virulence. the correct option is D
What is pathogen?
pathogen can be defined as an organism causing disease to its host with the severity of the disease symptoms referred to as virulence and also pathogens are taxonomically widely divers and comprise viruses and bacteria as well as unicellular and multicellular eukaryotes.
Pathogenic organisms are of five main types such as :
- Viruses
- Bacteria
- Fungi
- Protozoa
- Worms
Therefore all of the choices are the characteristics of a pathogen that determine its virulence. the correct option is D
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