Virus - A small infectious agent that replicates only inside the living cells of organisms and causes disease in humans, animals, and plants., Bacteria - Single-celled microorganisms that can exist in different environments. Some are beneficial, while others can cause illnesses., Antibiotic Resistance - The ability of bacteria to resist the effects of certain medicines making them difficult to treat., Immunisation - the process of protecting a person or animal from an infectious disease by putting a substance into the body that makes it produce antibodies, Chlamydia - A disease of the sexual organs that is caused by bacteria and that can be given from one person to another during sex, HIV - The virus that can cause Acquired Immune Deficiency Syndrome, Epidemiology - the scientific study of diseases and how they are found, spread, and controlled in groups of people, Pathogen - any small organism, such as a virus or a bacterium that can cause disease, Retrovirus - A type of RNA virus that inserts a copy of its genome into the DNA of a host cell that it invades, thus changing the genome of that cell, Herd Immunity - a situation in which a disease cannot spread through a group of people because enough of them are immune, usually because of having been vaccinated,

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