Malaria: A Protist Disease Revision Notes | GCSE OCR Foundation Biology

What this lesson covers

Students explore malaria as a disease caused by protist pathogens, examining the complex life cycle involving mosquitoes as vectors, understanding the s...

• Explain that malaria is caused by protist pathogens, not bacteria or viruses
• Describe the life cycle of the malarial protist including the mosquito vector
• Evaluate methods used to control the spread of malaria
• Apply knowledge of disease transmission to suggest prevention strategies

Key ideas to keep in view

Use this lesson to stay inside B6.3 Monitoring and maintaining health while connecting the detail back to the wider B6: Global challenges topic.

• B6: Global challenges
• B6.3 Monitoring and maintaining health
• GCSE OCR Foundation Biology

Lesson notes preview

Read the core explanations from Malaria: A Protist Disease before testing yourself from memory.

• When you hear 'infectious disease', you probably think bacteria or viruses. But malaria breaks that pattern — it's caused by something completely different.
• A protist called Plasmodium that infects red blood cells, causing recurrent fever episodes that can be fatal if untreated.
• Here's what makes protists different from other pathogens. Bacteria are single cells without a nucleus — their DNA floats freely. Viruses aren't even proper cells — they're just genetic material in a protein coat.
• Protists are single-celled organisms with a proper nucleus, like tiny animals. The malaria protist, Plasmodium, is a parasite that hijacks your red blood cells to reproduce.
• You can't catch malaria from someone coughing on you. The protist has a complex life cycle that requires two hosts: humans and mosquitoes.
• Here's how the cycle works. When an infected mosquito bites you, it injects saliva containing the protist. The protist travels to your liver, multiplies, then invades your red blood cells. This is when you get the classic malaria symptoms — fever, chills, and sweating.
• But the cycle doesn't end there. When another mosquito bites the infected person, it picks up the protist with the blood meal. Inside the mosquito, the protist reproduces sexually, creating new forms that can infect the next human victim.
• An organism that carries a pathogen from one host to another. The mosquito is the vector for malaria — it doesn't get sick but spreads the disease.
• Malaria isn't like a cold that you get once and recover from. It causes recurrent episodes of fever that can last for months or even years.
• This happens because the protist is clever. Some forms hide in your liver cells, staying dormant for weeks. Then they suddenly activate, burst out, and invade fresh red blood cells. Each time this happens, you get another fever episode.

Continue through the topic

Move to the related lessons or back to the topic page when you need the wider sequence before exam-style practice.