• Exactly every new bacterium is the same as the last one (it reproduces from)
• Sometimes B mutate and are produced differently from the others 
• Mutation may result in B being resistant to the AB
• When AB is used, non-resistant B are killed, but some resistant B remain
• Resistant B survive and reproduce
• Continued use of AB increases number of resistant bacteria
• Should always complete a course of AB, even if you start to feel better
• Otherwise there is more chance of resistant bacteria developing

• MRSA is resistant to most AB which treat infections
• Patients with MRSA have existing illness

• Important to not overuse AB
• AB not to treat non-serious infections e.g. sore throat
• AB prescribed only for serious disease
• Increased use of AB may result in them not working when you  need them too

• Flu/influenza lasts normally between 1-2 weeks
• Flu virus = produces new strands and people can’t be immune to it
• Flu epidemic = outbreak of flu affecting thousands in a country
• Pandemic Flu = flu spreading rapidly around many countries e.g. swine flu
• Antiviral drug

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