Pathogens are tiny organisms that can make you sick if they get inside your body. Viruses, bacteria, fungi, parasites and prions are pathogens.

The ability of a pathogen to cause disease is called pathogenicity. The degree to which an organism is pathogenic is called virulence. There are five main types of pathogens: virus, bacterium, fungus, …

Humans can be infected with many types of pathogens, including prions, viruses, bacteria, and fungi, causing symptoms like sneezing, coughing, fever, vomiting, and potentially lethal organ failure.

Oct 21, 2025 · Pathogens—bacteria, viruses, fungi, and parasites—are microorganisms that invade a host and cause illness. Learn more and how to protect yourself.

Nov 10, 2025 · A pathogen is any agent that can cause disease in its host, ranging from microscopic life forms to non-living particles. Scientists group these disease-causing agents into four primary …

Aug 21, 2020 · Pathogens are organisms that can cause disease. Learn more about the different types of pathogens, including how they function and the diseases that they produce.

Apr 3, 2019 · Pathogen types There are different types of pathogens, but we’re going to focus on the four most common types: viruses, bacteria, fungi, and parasites.

Apr 26, 2025 · Two main types of pathogens can infect you: Facultative pathogens. This type of pathogen can reproduce in a host or somewhere else, like on a surface in your home. Obligate …

Apr 29, 2025 · Understanding the different types of pathogens is essential for developing effective prevention and treatment strategies. This article explores the major categories of …

Revise the four main types of pathogens: bacteria, viruses, fungi, and protists. Learn how they cause disease and how the body defends itself. Includes real-world disease examples.