AIDS (acquired immune deficiency syndrome) - When HIV has damaged a person’s immune system, so they are more likely to get secondary infections., chalara dieback - A communicable disease of ash trees caused by a fungus. It produces lesions of the trunk and branches, and dieback of the top of the tree., cholera - A communicable disease caused by a bacterium, which causes extreme diarrhoea., diarrhoea - Loose or watery faeces., haemorrhagic fever - A disease that includes a fever (high body temperature) and internal bleeding, such as caused by the Ebola virus., host - An individual or species that can be infected by a certain pathogen., HIV (human immunodeficiency virus) - A virus that attacks white blood cells in the human immune system, often leading to AIDS., malaria - A dangerous disease, caused by a protist, that causes serious fever, headaches and vomiting and can lead to death., protist - A kingdom of eukaryotic and mainly single-celled organisms (also called ‘protoctists’)., secondary infection - An infection due to the immune system being weakened previously by a different pathogen., tuberculosis (TB) - A communicable bacterial disease that infects the lungs., ulcer - A sore area in the stomach lining which can be caused by a bacterium. , virus - A microbe that multiplies by infecting a cell and taking over the cell's DNA copying processes. Virus particles have no cellular structure and so are not true organisms., white blood cell - A type of blood cell that forms part of the body’s defence system against disease.,

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