First Time User? Enroll now.
Notice of Data Security Incident
COVID-19: Vaccine information, testing, treatment, and additional resources
Home > Health Library > Pathogen
A pathogen is a living organism that causes disease. Pathogens include bacteria, viruses, fungi, and protozoa.
Current as of: July 1, 2021
Author: Healthwise Staff
Medical Review:E. Gregory Thompson MD - Internal Medicine & Adam Husney MD - Family Medicine & Elizabeth T. Russo MD - Internal Medicine
To learn more about Healthwise, visit Healthwise.org.
© 1995-2021 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.