A Level Biology Revision "Communicable Diseases and Pathogens"

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