Pathogens and Disease AQA Biology GCSE
- Created by: Caitlinyx
- Created on: 22-04-13 16:58
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- Pathogens and Disease
- Bacteria
- Single celled living organisms
- Much smaller than animal and plant cells
- Some are useful and are used to make food like yoghurt and cheese
- Bacteria simply split in two inside the body
- They often produce toxins (poisons) which affect the body
- Virus
- Smaller than bacteria
- Regular shapes
- Cause disease in every type of living organism, from humans to bacteria
- Viruses take over the cells and as they reproduce, they destory the cells
- They rarely produce toxins
- Ignaz Semmelweis
- His Work
- Doctor in the mid-1850s
- Ignaz Semmelweis
- His Work
- Doctor in the mid-1850s
- At the time many mothers died from childbed fever and people did not know why
- He noticed that people did not wash their hands between dealing with patients
- He believed that the fever was caused by something being passed on
- He got medical students to wash their hands and less mothers died
- Doctor in the mid-1850s
- Getting his work accepted
- He showed his evidence to other doctors and he was mocked
- Many people thought that women getting the fever was God's punishment
- No one had ever seen bacteria and viruses
- Doctors didn't like the isea that they might have been spreading disease
- Now his ideas are accepted
- His Work
- Ignaz Semmelweis
- At the time many mothers died from childbed fever and people did not know why
- He noticed that people did not wash their hands between dealing with patients
- He believed that the fever was caused by something being passed on
- He got medical students to wash their hands and less mothers died
- Doctor in the mid-1850s
- Getting his work accepted
- He showed his evidence to other doctors and he was mocked
- Many people thought that women getting the fever was God's punishment
- No one had ever seen bacteria and viruses
- Doctors didn't like the isea that they might have been spreading disease
- Now his ideas are accepted
- His Work
- Infectious Diseases
- Found all over the world
- Mild - common cold and tonsillitus
- Killers - tetanus, influenza and HIV/AIDs
- Passed from person to person, so they are infectious
- Caused by micro-organisms (pathogens) entering and attacking the body
- Pathogens reproduce rapidly inside the body
- Disease Symtoms
- Commom symptons are headaches, rashes and high temperatures
- These are caused by the damage or toxins made by the pathogens
- Symtoms also appear for how your body responds
- Bacteria
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