Author: Freesciencelessons via YouTube
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In this video, we look at communicable diseases and pathogens. First I explain what is meant by a communicable disease and by a pathogen. I then look at the features of four categories of pathogens: bacteria, viruses, fungi and proctoctista (which are also called protista).

Image credits:
Bacterial meningitis
https://commons.wikimedia.org/wiki/File:Meningitis-MRI.JPG
MBq at the German-language Wikipedia, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons

HIV
https://commons.wikimedia.org/wiki/File:HIV-1_Transmission_electron_micrograph_AIDS02bbb_lores.jpg
Content Providers: CDC/Dr. Edwin P. Ewing, Jr., Public domain, via Wikimedia Commons

Malaria
https://commons.wikimedia.org/wiki/File:Malaria_tropica_blood_stain.jpg
El*Falaf, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

Oral Thrush
https://commons.wikimedia.org/wiki/File:Human_tongue_infected_with_oral_candidiasis.jpg
James Heilman, MD, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons

Athlete’s foot
https://commons.wikimedia.org/wiki/File:FeetFungal.JPG

James Heilman, MD, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons

Athlete’s foot fungus
https://commons.wikimedia.org/wiki/File:Athlete%27s_Foot_Fungus_microscope.jpg
Ecorahul, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons

E. coli
https://commons.wikimedia.org/wiki/File:EscherichiaColi_NIAID.jpg
Credit: Rocky Mountain Laboratories, NIAID, NIH, Public domain, via Wikimedia Commons

Papilloma virus
https://commons.wikimedia.org/wiki/File:Papilloma_Virus_(HPV)_EM.jpg
Author: Unknown photographer/artistSource: Laboratory of Tumor Virus Biology, Public domain, via Wikimedia Commons

Fungus on onions
https://commons.wikimedia.org/wiki/File:Rust_on_garlic_plants2.jpg
Downtowngal, Public domain, via Wikimedia Commons

Giardia
https://commons.wikimedia.org/wiki/File:Giardia_lamblia_SEM_8698_lores.jpg
CDC / Janice Haney Carr, Public domain, via Wikimedia Commons

Malaria sporozoites
https://commons.wikimedia.org/wiki/File:Malaria_Sporozoites_(16657642929).jpg
NIAID, CC BY 2.0 https://creativecommons.org/licenses/by/2.0, via Wikimedia Commons

Fungus on willow
https://commons.wikimedia.org/wiki/File:Melampsora_caprearum_a1_(7).jpg

Jerzy Opioła, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

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