- Infectious Diseases 2
- Pain killers- get rid of symptoms (eg headache), they do not kill the pathogen
- Antibiotics-help to cure bacterial disease by killing infectious
bacteria inside the body
- Antibiotics cannot be used to kill viruses because they live and reproduce inside cells.
- If antibiotic is prescribed too much it develops resistance (cannot be killed by that antibiotic)
- Pathogens mutate, producing
- Mutations- a random, spontaneous change in DNA- all offspring of the mutation will also be resistant
- 1) Bacterium develops resistance to an antibiotic 2)Bacterium divides and reproduces 3)Population of antibiotic resistant bacteria
- The new strain will then spread rapidly because people are not immune to it and there is no effective treatment.
- Now, antibiotics are not used to treat non-serious infections, such as mild throat infections, so that the rate of development of resistant strains is slowed down.
- Pathogens mutate, producing resistant strains.
- To investigate antibiotics and disinfectants uncontaminated cultures of microorganisms are
- Petri dishes and culture media (agar) must be sterilised before use to kill unwanted microorganisms
- Inoculating loops used to transfer microorganisms to the media must be sterilised by passing them through a flame
- The lid of the Petri dish should be secured with adhesive tape to prevent microorganisms from the air contaminating the culture.
- In schools, cultures should be incubated at 25 degrees to reduce the likelihood of pathogens growing
- In industry, cultures are incubated in much higher temps because the are better equipped to handle pathogens and growth of microorganisms is more rapid