Disease - any change that impairs the function of an organism in some way and causes harm, Non-infectious disease - a disease that cannot be spread from one organism to another, virus - a very simple microorganism that infects cells and may cause disease, infectious disease - a disease that is contagious and caused by a pathogen, pathogen - disease causing microorganism , Vector - organism that carries pathogens between other organisms without being affected by the disease , quarantine - strict isolation of sick people away from others for a period of time, parasite - organism that obtains resources from another organism (host) that it lives in or on, and can cause harm to, host - organism living in a relationship with another organism, fungi - organisms such as mushrooms and mould - some help to decompose dead or decaying matter and some cause disease, inflammation - a reaction of the body to an infection, commonly characterised by heat, redness, swelling and pain., White Blood Cells - living cells that fight bacteria and viruses, immunisation - administering an antigen, such as vaccines, with the aim of producing enhanced immune response in a future exposure, bacteria - tiny, single-celled living organisms that can be beneficial or harmful to humans., epidemic - a disease affecting a large number of people in a particular area in a short amount of time, pandemic - a disease occurring throughout an entire country, country or worldwide,

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