EVERYDAY SCIENCE

Detailed explanation-1: -Pathogenic organisms are of five main types: viruses, bacteria, fungi, protozoa, and worms.

Detailed explanation-2: -Viruses and bacteria can be pathogens, but there are also other types of pathogens. Every single living thing, even bacteria themselves, can get infected with a pathogen. The world is full of pathogens.

Detailed explanation-3: -A pathogenic organism is an organism capable of causing disease in its host. A human pathogen is capable of causing illness in humans. Common examples of pathogenic organisms include specific strains of bacteria like Salmonella, Listeria and E. coli, and viruses such as Cryptosporidium.