Incidence and outcomes of healthcare-associated COVID-19 infections: significance of delayed diagnosis and correlation with staff absence

J Hosp Infect. 2020 Dec;106(4):663-672. doi: 10.1016/j.jhin.2020.10.006. Epub 2020 Oct 13.

Abstract

Background: The sudden increase in COVID-19 admissions in hospitals during the SARS-CoV-2 pandemic of 2020 led to onward transmissions among vulnerable inpatients.

Aims: This study was performed to evaluate the prevalence and clinical outcomes of healthcare-associated COVID-19 infections (HA-COVID-19) during the 2020 epidemic and study factors which may promote or correlate with its incidence and transmission in a Teaching Hospital NHS Trust in London, UK.

Methods: Electronic laboratory, patient and staff self-reported sickness records were interrogated from 1st March to 18th April 2020. HA-COVID-19 was defined as COVID-19 with symptom onset within >14 days of admission. Test performance of a single combined throat and nose swab (CTNS) for patient placement was calculated. The effect of delayed RNA positivity (DRP, defined as >48 h delay), staff self-reported COVID-19 sickness absence, hospital bed occupancy, and community incidence of COVID-19 was compared for HA-COVID-19. The incidence of other significant hospital-acquired bacterial infections (HAB) was compared with previous years.

Results: Fifty-eight HA-COVID-19 (7.1%) cases were identified. When compared with community-acquired admitted cases (CA-COVID-19), significant differences were observed in age (P=0.018), ethnicity (P<0.001) and comorbidity burden (P<0.001) but not in 30-day mortality. CTNS-negative predictive value was 60.3%. DRP was associated with greater mortality (P=0.034) and incidence of HA-COVID-19 correlated positively with DRP (R = 0.7108) and staff sickness absence (R = 0.7815). For the study period HAB rates were similar to the previous 2 years.

Conclusions: Early diagnosis and isolation of COVID-19 patients would help to reduce transmission. A single CTNS has limited value in segregating patients into positive and negative pathways.

Keywords: Coronavirus; HCW infections; Nosocomial infections.

MeSH terms

  • Absenteeism
  • Aged
  • Aged, 80 and over
  • COVID-19 / diagnosis
  • COVID-19 / epidemiology
  • COVID-19 / transmission*
  • COVID-19 / virology
  • Case-Control Studies
  • Comorbidity
  • Cross Infection / epidemiology*
  • Cross Infection / prevention & control*
  • Cross Infection / virology
  • Delayed Diagnosis / adverse effects*
  • Female
  • Global Burden of Disease / statistics & numerical data
  • Humans
  • Incidence
  • London / epidemiology
  • Male
  • Predictive Value of Tests
  • Prevalence
  • Risk Factors
  • SARS-CoV-2 / genetics
  • Self Report