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Table 1 Aggregate statistics of nosocomial influenza* and healthcare worker vaccination rates from Oct 2013 to Oct 2018

From: The impact of healthcare worker influenza vaccination on nosocomial influenza in a tertiary hospital: an ecological study

Period Oct 2013 - Sep 2014 Oct 2014 - Sep 2015 Oct 2015 - Sep 2016 Oct 2016 - Jun 2017 Jul 2017 - Apr 2018 May 2018 - Oct 2018 Total
Patient Days 477,833 494,391 486,375 364,511 408,613 248,287 2,480,010
Number of Inpatients Tested for Influenzaa 4242 4741 6249 4054 4577 2417 26,280
Number of Influenza Casesb 623 694 856 621 568 241 3603
Nosocomial Influenza Casesb 36 71 48 52 31 18 256
Incidence Rate (per 10,000 patient-days) 0.75 1.44 0.99 1.43 0.76 0.72 1.03
Proportion of Nosocomial Cases 5.8% 10.2% 5.6% 8.4% 5.5% 7.5% 7.1%
Overall Vaccination Rate 52.1% 48.8% 50.9% 51.3% 70.9% 77.1%
Clinical Staff Vaccination Rate (Doctors, Nurses, Allied Health Professionals) 56.3% 49.4% 54.7% 52.9% 72.6% 78.9%
Non-Clinical Staff Vaccination Rate (Ancillary and Administrative Staff) 40.9% 47.1% 42.5% 48.1% 67.2% 72.6%
  1. *Nosocomial influenza is defined as influenza diagnosed by laboratory tests 7 days or more after admission
  2. aEnumerated by episodes of inpatient admission
  3. bLaboratory-confirmed