MRSA, or methicillin-resistant Staphylococcus aureus bacteria, live on your skin and in your nose.
This sore throat was caused by Streptococcus pyogenes bacteria. An antibiotic – penicillin – destroys the bacteria. Different antibiotics target different bacteria.
Mutations happen naturally. Only a tiny proportion of bacteria mutate, in just a very few people. Antibiotics may no longer be effective against these changed bacteria. Developing new antibiotics is a very difficult and time-consuming process.
Bacteria reproduce incredibly quickly. So large numbers of antibiotic-resistant bacteria are quickly formed.
MRSA is resistant to most antibiotics, even the powerful methicillin. Further resistance can be prevented by taking antibiotics only when necessary finishing all the tablets, even when you feel better doctors prescribing the correct antibiotic for each type of bacteria
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Student activity 1 preview: 2 How do drug-resistant bacteria develop?read pieces of text and Sometimes, the genes in bacteria change, or mutate. This happens naturally. Mosttranslate the information mutations are not useful to bacteria, butinto image captions, to occasionally they make bacteria resist antibiotics.provide the minister’s Sam has a throat infection. He takes antibioticbriefing. tablets. The antibiotic kills nearly all the bacteria. But a few bacteria – the resistant ones – survive. These bacteria reproduce rapidly. This is natural selection.2 How do drug-resistant bacteria develop? genes Sam takes an bacteria antibiotic in Sam
Student activity 2 preview: Research Cockroach lab 1‘visit’ the labs, examine two Scientist Simon Lee, UKpieces of evidence, anddraw a justified Hypothesiisfections in humansjuibecause could cut MRSA n Cockroach brain ceconclusion, using the it contains substances that kill bacteria.Lifeline Investigation ● grow two types of bacteria on agar plates ● add cockroach brain juice and leave for two hours at 37 ºC. Data Type of bacteria Percentage of bacteria killed MRSA More than 90 Escherichia coli More than 90 If an antibiotic kills 90% of the bacteria, your body’s immune system can kill the rest.