Some bacteria cause disease.

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Presentation transcript:

KEY CONCEPT Understanding bacteria is necessary to prevent and treat disease.

Some bacteria cause disease. Bacteria cause disease by invading tissues or making toxins. A toxin is a poison released by an organism.

Normally harmless bacteria can become destructive. may colonize new tissues

Normally harmless bacteria can become destructive. immune system may be lowered

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.

Bacteria can evolve resistance to antibiotics. Bacteria are gaining 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. overuse underuse misuse Antibiotics must be used properly.