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18.6 Bacterial Diseases and Antibiotics KEY CONCEPT Understanding bacteria is necessary to prevent and treat disease.

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Presentation on theme: "18.6 Bacterial Diseases and Antibiotics KEY CONCEPT Understanding bacteria is necessary to prevent and treat disease."— Presentation transcript:

1 18.6 Bacterial Diseases and Antibiotics KEY CONCEPT Understanding bacteria is necessary to prevent and treat disease.

2 18.6 Bacterial Diseases and Antibiotics Some bacteria cause disease. Bacteria cause disease by invading tissues or making toxins. A toxin is a poison released by an organism.

3 18.6 Bacterial Diseases and Antibiotics Normally harmless bacteria can become destructive. –may colonize new tissues

4 18.6 Bacterial Diseases and Antibiotics –immune system may be lowered Normally harmless bacteria can become destructive.

5 18.6 Bacterial Diseases and Antibiotics Antibiotics are used to fight bacterial disease. Antibiotics may stop bacterial cell wall formation. Antibiotics do not work on viruses. Prevention is best method to fight bacterial disease.

6 18.6 Bacterial Diseases and Antibiotics Bacteria can evolve resistance to antibiotics. A bacterium carries genes for antibiotic resistance on a plasmid. A copy of the plasmid is transferred through conjugation. Resistance is quickly spread through many bacteria. Bacteria are gaining resistance to antibiotics. –overuse –underuse –misuse Antibiotics must be used properly.


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