parasite - A living thing that lives on or in the body of living things, host - a living thing that a parasite infects, defence - protection against something, barrier - an object that stops getting through or past it, mucus - a sticky subtance found in our nose, windpipe or air passage, hygiene - keeping yourself and around you clean, vector - a living thing that cause disease but does not cause it, repellent - a substance that keep an insect away,

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