Friday, October 7, 2011

3.33 Antibiotic resistance

Understand how resistance to antibiotics can increase in bacterial populations. 

1. Staphylococcus aureus ---> causes skin infections + lung infections

2. Infections can be treated with methecilline (antibiotic) it kills the Staphylococcus aureus. This is the susceptible form. MSSA.

3. Staphylococcus aureus infection increase is  caused by random mutation and when the methecilline (antibiotic) is applied - the bacteria does not die - this is called the resistant form. MRSA
The mutation has created genes in Staphylococcus aureus  that makes it resistant so it doesn't die from the methecilline (antibiotic).

4. Commonly found in hospitals - from treatment of people with wounds. Resulting in the methecilline (antibiotic) no longer working. 

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