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Comparison of national and Maryland VA usage of CDSS targeted antibiotics. The ratio (Number of prescriptions / All drug prescriptions) is multiplied by 100 and the percentage is reported on the y-axis. The vertical dotted line indicates when moxifloxacin replaces gatifloxacin in the VA formulary and defines the pre- and post-withdrawal periods. Note the marked seasonality of usage for azithromycin and the fluoroquinolones
