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What is a Pathogen? 4 Types and How They Spread Disease - Healthline
Pathogen - Wikipedia
Pathogens: Definition, types, diseases, prevention, and more
Q&A: What are pathogens, and what have they done to and for …
Pathogen Definition & Meaning - Merriam-Webster
Pathogen Definition and Examples - Biology Online Dictionary
All About Pathogens: Bacteria, Viruses, and More - WebMD
Introduction to Pathogens - Molecular Biology of the Cell - NCBI …
What Are the Five Pathogens? - MedicineNet
Pathogens | ABCs | CDC