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Evolution of Antibiotic Resistance-Printable Format - Teach ...

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<strong>Antibiotic</strong> Usage<br />

% Resistant Strains<br />

0.95<br />

0.9<br />

0.85<br />

0.8<br />

1<br />

1.35<br />

1.3<br />

1.25<br />

1.2<br />

1.15<br />

1.1<br />

1.05<br />

100<br />

90<br />

80<br />

70<br />

60<br />

50<br />

40<br />

30<br />

20<br />

10<br />

0<br />

1978<br />

1978<br />

1979<br />

1979<br />

Annual <strong>Antibiotic</strong> Usage<br />

1980<br />

1981<br />

1982<br />

1983<br />

1984<br />

1985<br />

1986<br />

Year<br />

1987<br />

1988<br />

1989<br />

Percentage <strong>of</strong> Resistant Strains<br />

1980<br />

1981<br />

1982<br />

1983<br />

1984<br />

1985<br />

1986<br />

Year<br />

1987<br />

1988<br />

1989<br />

1990<br />

1990<br />

1991<br />

1991<br />

1992<br />

1992<br />

1993<br />

1993

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