Causes the Flu, Covid-19, common cold
Examples are amoebas, algae; can cause malaria
A large, eukaryotic, multicellular, parasitic worm
Any of various infectious proteins that are abnormal forms of normal cellular proteins
Can cause ringworm, valley fever, athletes foot
Saprophytic and parasitic spore-producing eukaryotic organisms that lack chlorophyll
Any eukaryotic protist of the phylum or subkingdom Protozoa
Any of a large group of nonliving, submicroscopic infective agents that typically comprise an RNA or DNA core of genetic material surrounded by a protein coat
An example is a tapeworm that can live and feed in human intestines
Causes Mad Cow Disease
Causes whooping cough, TB, strep throat
A single-celled, prokaryotic microorganism
Prions
Viruses
Bacteria
Protists
Helminths
Fungi
All pathogens are living organisms
Pathogens can be visible with the naked eye or with a microscope