Learn: Pathogens - Bacteria, Viruses, Fungi, Protists

Welcome!Building on your knowledge of communicable and non-communicable diseases, this lesson will introduce you to pathogens. You'll learn what they are, how they cause disease, and the differences between types like bacteria, viruses, fungi, and protists. Let's get started!

What are Pathogens?Pathogens are microorganisms that cause disease. They include bacteria, viruses, fungi, and protists. Pathogens can spread through air, water, direct contact, or vectors like insects.

BacteriaBacteria are small single-celled organisms. Some are harmless, but others can cause diseases like salmonella or tuberculosis. They reproduce rapidly in the body and may release toxins that damage tissues.

VirusesViruses are much smaller than bacteria and require a host cell to reproduce. They invade cells and use them to replicate, often destroying the host cells in the process. Diseases caused by viruses include influenza and HIV.

FungiFungi can be single-celled or multicellular organisms. They may cause diseases like athlete's foot by growing on or inside the body. Fungi often spread via spores, which can travel through air or water.

ProtistsProtists are single-celled organisms that can cause diseases like malaria. They often rely on vectors, such as mosquitoes, to spread and infect hosts.

Review Time!Great work! You've learned about pathogens and their types: bacteria, viruses, fungi, and protists. Let's test your understanding with a few questions.

Well Done!You've completed the lesson on pathogens. Understanding how bacteria, viruses, fungi, and protists cause disease is essential for understanding communicable diseases. Keep up the great work!