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Download 18.6 Bacterial Diseases and Antibiotics KEY CONCEPT
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Transcript
18.6 Bacterial Diseases and Antibiotics KEY CONCEPT Understanding bacteria is necessary to prevent and treat disease. 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. 18.6 Bacterial Diseases and Antibiotics • Normally harmless bacteria can become destructive. – may colonize new tissues 18.6 Bacterial Diseases and Antibiotics • Normally harmless bacteria can become destructive. – immune system may be lowered 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. 18.6 Bacterial Diseases and Antibiotics Bacteria can evolve resistance to antibiotics. • Bacteria are gaining resistance to antibiotics. A bacterium carries – overuse genes for antibiotic resistance on a plasmid. – underuse – misuse A copy of the plasmid is through • Antibiotics must be transferred conjugation. used properly. Resistance is quickly spread through many bacteria.
