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Epidemiology of COVID-19 in Northern Ireland, 26 February 2020-26 April 2020

J Pett1,2, P McAleavey1, P McGurnaghan1

  • 1Public Health Agency Northern Ireland, Belfast, Northern Ireland.

Epidemiology and Infection
|January 29, 2021
PubMed

Insights

Household contacts experienced a significantly higher risk of SARS-CoV-2 infection, with a 15.9% secondary attack rate. This highlights the critical need for interventions to reduce transmission within households.

Area of Science:

  • Epidemiology
  • Infectious Disease Transmission
  • Public Health

Background:

  • Coronavirus disease 2019 (COVID-19) emerged globally in late 2019.
  • Understanding transmission dynamics is crucial for effective control strategies.
  • Enhanced surveillance and contact tracing are vital for monitoring outbreaks.

Purpose of the Study:

  • To describe COVID-19 epidemiology in Northern Ireland (NI) from February to April 2020.
  • To analyze contact tracing data to estimate secondary attack rates (SAR) for SARS-CoV-2.
  • To determine the relative risk of infection among different contact categories.

Main Methods:

  • Analysis of epidemiological data from Northern Ireland (February-April 2020).
  • Examination of enhanced surveillance and contact tracing data (February-March 2020).
  • Estimation of SAR and relative risk using logistic regression for SARS-CoV-2 contacts.

Main Results:

  • COVID-19 incidence and mortality in NI were lower than in the rest of the UK.
  • Household contacts had a SAR of 15.9%, over six times higher than 'high-risk' contacts (2.5%).
  • Household contacts showed 11.0 times higher odds of testing positive for SARS-CoV-2 compared to other contacts.

Conclusions:

  • The household is a primary setting for SARS-CoV-2 transmission.
  • Interventions targeting household transmission are urgently needed.
  • Further research is required to understand and mitigate household-based spread.

Keywords:
COVID-19Coronaviruspandemicsurveillancetransmission

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