Holy Family Catholic High School 17th April 2007 Developing medicines + Immunity UNIT 11.4 Controlling infectious disease Form 10 A4.

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Presentation transcript:

Holy Family Catholic High School 17th April 2007 Developing medicines + Immunity UNIT 11.4 Controlling infectious disease Form 10 A4

Learning Objectives -Explain how can we develop new medicines. -Describe why can’t use antibiotics to treat diseases caused by viruses. -Describe the meaning of mutation and antibiotic resistance. - Explain how does our immune system work.

Medicines and treat disease... Two main types of medicines Those that threat the symptoms only but do not cure the disease. e.g paracetamol Those that kill bacteria. e.g Penicillin

What about problems of drugs that treat viruses?

What is an ANTIBIOTIC? They are medicines that can be used to kill ONLY bacteria inside the body. e.g Penicillin

What is an antibiotic resistance? Caused by the direct action of the antibiotic. When it kills the bacteria it selects for those bacteria that are resistant. The resistance is caused by genes in the bacterial chromosome, formed by MUTATION. A change in the genetic content of a cell caused by chemicals like radiation, Xrays.