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Types of pathogens
Unit 3&4 VCE Biology
| Term | Definition |
|---|---|
| incubation period | time period between infection and the first appearance of any symptoms of the disease |
| virus | non-cellular pathogen that is composed of nucleic acid (DNA or RNA) surrounded by a protein coat, cannot reproduce unless inside a host cell |
| vector | disease carrying organism, eg mosquito carrying malaria |
| antigen | compound that can trigger an immune response |
| MHC I | protein marker found on all cells except red blood cells that mark the cell as self or non-self and can present self or non-self antigens |
| pathogen | disease causing agent |
| non-cellular pathogen | disease causing agent that is not categorised as being made of cells, for example: virus, prion |
| fungi | cellular pathogen that produces spores, for example yeast |
| self-antigens | displayed on MHC markers and recognised as self (normal proteins produced by the cell/organism) |
| prion | non-cellular pathogen composed only of protein |
| allergic response | occurs when the immune system reacts to a substance (allergen) that is usually harmless - a hypersensitivity |
| bacteriophage | non-cellular pathogen: virus that infects bacteria |
| infectious disease | disease caused by an organism (mostly a micro-organism) that can be transmitted from one person to another |
| cellular pathogen | disease causing agent that is categorised as being made up of cells for example: bacteria, fungi |
| autoimmune response | occurs when the immune system fails to recognise 'self' antigens & cells and begins to attack its own cells, example: multiple sclerosis |
| bacteria | cellular pathogen that is susceptible to treatment by antibiotics |
| MCH II | protein marker found on antigen presenting cells, used to present antigen to other immune cells |
| parasite | cellular pathogen that lives on/on another organism and causes harm to the organism |
| allergen | usually harmless substance that causes a hypersensitivity allergic reaction in some people |
| protist | cellular pathogen: unicellular, eukaryotic, belongs to protist kingdom, for example - malaria |
| virulence | degree to which an organism can cause disease |