GCSE Biology: Pathogens and Communicable Diseases

The infection and response topic asks for something unusual at GCSE: precise recall of a specific list of diseases, each with its pathogen type, transmission route and prevention. This quiz covers that exact list — the one that appears in the current specifications — disease by disease.

The pathogen questions establish the four types and their contrasting mechanisms: bacteria damaging the body chiefly by releasing toxins, viruses replicating inside host cells (the reason they are so hard to treat, tested through a dedicated comparison question), fungi and protists. The viral diseases get their specification-mandated coverage: measles as a serious vaccine-preventable disease, HIV with its initial flu-like illness and progression, and tobacco mosaic virus with its mosaic leaf discolouration and reduced photosynthesis — the one plant virus every student must know.

The bacterial diseases follow — salmonella from contaminated food and gonorrhoea with its discharge and urination symptoms — then rose black spot as the fungal example spread by water and wind, and malaria as the protist disease with its mosquito vector. The malaria control question requires the two-pronged logic the mark schemes want: prevent bites and destroy breeding grounds.

The prevention questions generalise across diseases: hygiene, barrier methods, vaccination and vector control. Every question is fully self-contained, and each explanation names the pathogen type explicitly, reinforcing the classification skill that underpins the whole topic. This set pairs with the Defences, Vaccination and Drugs quiz, which covers what happens after a pathogen gets in.

• Classify pathogens as bacteria, viruses, fungi or protists and explain how each causes harm
• Recall the symptoms and spread of measles, HIV and tobacco mosaic virus
• Recall the bacterial diseases salmonella and gonorrhoea and their prevention
• Describe rose black spot and malaria, including the mosquito vector
• Select appropriate prevention measures for different transmission routes

Topic scope follows the infection and response section of the Department for Education's GCSE combined science subject content: communicable diseases caused by viruses, bacteria, fungi and protists in humans and plants, and how their spread can be reduced or prevented.