The number of different extended-spectrum antibacterials received by the patient each empiric day-of-therapy (outcome measure unit), averaged over the empiric days (the first 3 days of hospitalization), summed across all participants. Note that Days-of-Therapy unit is a standardized national measure for antibacterial use in hospitals. For clarity the calculation is as follows: we define a DOT for a particular ES antibiotic as a day in which any number of doses of that antibiotic is given. Different ES antibiotics are summed across the empiric days for each patient admission, then divided by the empiric days for that patient-admission to determine each admission's DOT per at-risk day. If an admission is less than 3 days, only the number of days the patient is admitted will contribute to the numerator and denominator.

The total number of participants analyzed reported here is from the intervention period.

The number of days that Vancomycin is received by the patient averaged over the empiric days (the first 3 days of hospitalization), summed across all participants. Note that Days-of-Therapy unit is a standardized national measure for antibacterial use in hospitals. For clarity the calculation is as follows: we define a DOT for a particular ES antibiotic as a day in which any number of doses of that antibiotic is given. Different ES antibiotics are summed across the empiric days for each patient admission, then divided by the empiric days for that patient-admission to determine each admission's DOT per at-risk day. If an admission is less than 3 days, only the number of days the patient is admitted will contribute to the numerator and denominator.

The total number of participants analyzed reported here is from the intervention period.

The number of different antipseudomonals received by the patient each empiric day of therapy, averaged over the empiric days (the first 3 days of hospitalization), summed across all participants. Note that Days-of-Therapy unit is a standardized national measure for antibacterial use in hospitals. For clarity the calculation is as follows: we define a DOT for a particular ES antibiotic as a day in which any number of doses of that antibiotic is given. Different ES antibiotics are summed across the empiric days for each patient admission, then divided by the empiric days for that patient-admission to determine each admission's DOT per at-risk day. If an admission is less than 3 days, only the number of days the patient is admitted will contribute to the numerator and denominator.

The total number of participants analyzed reported here is from the intervention period.

Days from start of standard-spectrum antibacterial until switch to extended-spectrum antibacterial during hospital stay, if that occurs. If it doesn't occur, the number of days is censored (capped) at the patient's hospital discharge or at the end of data collection. Almost all patients will be discharged before the end of trial data collection.

The mean number of days to event here is from the intervention period.

Days from hospital admission until transfer to ICU, if that occurs. If it doesn't occur, the number of days is censored (capped) at the patient's hospital discharge or at the end of data collection. Almost all patients will be discharged before the end of trial data collection.

The mean number of days to event here is from the intervention period.

Days from hospital admission until discharge. If the patient remains in the hospital at the end of the trial data collection, the number of days is censored (capped) at that time. Almost all patients will be discharged before the end of trial data collection.

The mean number of days to event here is from the intervention period.

The summed number of different ES antibacterials received each day, measured repeatedly on or after 4 calendar days of admission and divided by the number of days from hospital day 4 through discharge.

Note: this outcome is intended for a secondary manuscript.

Empiric and total antibacterial costs during hospitalization.

Note: this outcome is intended for a secondary manuscript.

Hospital-onset C. difficile positive tests (specimen obtained) after 3 calendar days of admission during hospitalization.

Note: this outcome is intended for a secondary manuscript.

Newly-detected hospital-onset MDRO-positive cultures (on or after 3 calendar days of admission). Includes total MDRO and specific MDRO subsets.

Note: this outcome is intended for a secondary manuscript.

The summed number of different fluoroquinolone antibacterials received each day, measured repeatedly over (1) the first three days (empiric) of an admission and divided by the number of days of the admission and (2) all days of an admission divided by the total number of admission days.

Note: this outcome is intended for a secondary manuscript.