Pathogens and Infectious Disease

What is Pathogens and Infectious Disease?

Within Biology, which covers cells, the human body, genetics, evolution, plants and ecosystems: the science of living things, this topic explains Pathogens and Infectious Disease. Biology topics show how living things work, from the cell up to whole ecosystems, with models you can explore step by step.

Check that you can explain Pathogens and Infectious Disease in your own words and give one example from everyday life. If you can do that, you have understood the core idea.

Understanding Pathogens and Infectious Disease helps you explain how living things stay alive and respond to their surroundings, which is central to biology exams.

Pathogens and Infectious Disease in detail

Pathogens are microorganisms that cause disease: bacteria, viruses, fungi and protists. Bacteria, such as Salmonella, release toxins, viruses such as influenza invade cells and reproduce inside them, fungi cause athlete's foot, and protists such as the malaria parasite are spread by vectors, such as mosquitoes.

Pathogens spread by air, water, direct contact, food and animals. Prevention includes hygiene, clean water, sterilisation, vaccination and controlling vectors. Understanding how diseases spread helps public health, such as quarantine, hand washing and the use of mosquito nets.

How the interactive helps you understand Pathogens and Infectious Disease

Watch the cycle in the interactive. Use any sliders or buttons it offers to change the values and see how the cycle responds.

Before you change anything, predict the result. Then change one value at a time and check whether your prediction was right. This is a quick way to build a correct mental model of Pathogens and Infectious Disease.

Real-life uses and examples

• Use Pathogens and Infectious Disease to interpret a diagram, graph or microscope image from a practical.
• Structure a longer answer about Pathogens and Infectious Disease by moving from definition to example to consequence.
• Explain how Pathogens and Infectious Disease helps a living thing stay alive, using a plant or animal example.

Common mistakes to avoid

• Using everyday words, such as “energy” or “bad”, without their scientific meaning.
• Listing the steps of a process without saying how one step causes the next.
• Learning the definition without testing it. Use the quiz and the interactive to check that you can apply the idea.