EVERYDAY SCIENCE

Detailed explanation-1: -A variety of microorganisms can cause disease. Pathogenic organisms are of five main types: viruses, bacteria, fungi, protozoa, and worms.

Detailed explanation-2: -A pathogen is a micro-organism that has the potential to cause disease. An infection is the invasion and multiplication of pathogenic microbes in an individual or population.

Detailed explanation-3: -Pathogens. A pathogen or infectious agent is a biological agent that causes disease or illness to its host. This term is most often used for agents that disrupt the normal physiology of animal or plant. Pathogens can be a bacterium, virus, or other microorganisms that can cause disease.

Detailed explanation-4: -There are different types of pathogens, but we’re going to focus on the four most common types: viruses, bacteria, fungi, and parasites.

Detailed explanation-5: -Among the bacterial pathogens, Escherichia coli, Salmonella, Shigella, Campylobacter, Salmonella typhi, Vibrio cholerae, and Pseudomonas are mostly encountered in the environment.