38. Protist & Fungal Disease

This video covers the characteristics of fungi and protists, how they cause disease, and specific examples including Rose Black Spot and Malaria.

1. Fungal Diseases

Fungi are eukaryotic organisms that can be unicellular (like yeast) or multicellular (like mushrooms).

• Structure: Multicellular fungi often have thread-like structures called hyphae. These can penetrate human skin or the surface of plants to cause disease. Hyphae also produce spores, which allow the fungus to spread.

• Example: Rose Black Spot

  • Symptoms: Purple or black spots develop on the leaves of plants (especially roses). Leaves may turn yellow and drop off.

  • Impact: Loss of leaves reduces the plant's ability to photosynthesize, which stunts growth.

  • Transmission: Spread through the environment by water or wind.

  • Treatment: Using fungicides (chemicals that kill fungi) or removing and destroying infected leaves to prevent further spread.

2. Protist Diseases

Protists are also eukaryotic and are mostly single-celled. Many are parasites, meaning they live on or inside a host organism at the host's expense.

• Transmission via Vectors: Protists are often carried by vectors—organisms that transport the pathogen between hosts without getting sick themselves.

• Example: Malaria

  • Pathogen: A parasitic protist.

  • Vector: The Mosquito. When a mosquito feeds on an infected animal, it picks up the protist and transfers it to the next healthy animal it bites.

  • Symptoms: Recurrent episodes of severe fever and headaches. It can be fatal.

  • Prevention:

    • Targeting the Vector: Destroying mosquito breeding sites or using insecticides to kill them.

    • Personal Protection: Using mosquito nets and insect repellent to prevent bites.

Summary Table: Fungi vs. Protists