Definition of pathogens

Fungus

A eukaryotic organism that does not photosynthesise and feeds on dead or decaying material

Alga

A eukaryotic organism that is not an animal, a plant or a fungus

Pathogen

A microorganism that causes disease

Virus

A non-living in infectious pathogen that replicates inside the cells of another organism

Infection

A pathogen reaching the tissues of a new organism

Hygiene

A practice that keeps things clean to stop the spread of pathogens

Bacterium

A prokaryotic organism (no nucleus)

Toxin

A protein poison produced by a pathogen

Vaccination

Injecting a dead or weakened form of a pathogen to develop immunity, without the individual having to suffer from the disease

Vector

Something that carries a pathogen from one organism to another