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The Department of Health has published a report on antibody and vaccination data from the COVID-19 Infection Survey (CIS).

The findings set out in this report relate to estimates for NI for the week beginning 19 April 2021.

Key findings

Due to the relatively small number of people who tested positive for antibodies within our sample, credible intervals are wide and therefore results should be interpreted with caution.

  • In Northern Ireland, an estimated 6 in 10 adults, or 63.5% of the adult population (95% credible interval: 57.6% to 71.2%) would have tested positive for antibodies against SARS-CoV-2 on a blood test in the week beginning 19 April 2021, suggesting they had the infection in the past or have been vaccinated.
  • The percentage of adults aged 70 years and over testing positive for antibodies was 83.4% (95% credible interval: 70.3% to 92.1%) in the week beginning 19th April 2021. The percentage of adults testing positive for antibodies in the other age groups ranged from 29.0% to 83.7%.
  • The survey provides an estimate of the percentage of people that have been vaccinated however it should be noted that the figures are based on self-report and may differ from official figures which are a more precise count of total vaccines issued.
  • The survey estimates will allow for additional analysis of vaccination information with other characteristics, such as testing positive for antibodies.
  • The survey shows that in Northern Ireland, an estimated 73.0% (95% credible interval: 72.0% to 74.1%) of the adult population have been vaccinated (at least one dose) against SARS-CoV-2 in the week beginning 19 April 2021.
  • In the week beginning 19th April 2021, the survey shows the percentage of people who have been vaccinated against SARS-CoV-2 for those aged 70 years and over was 98.6% (95% credible interval: 97.8% to 99.1%). The percentage in the other age groups ranged from 16.9% to 94.2%.
  • The survey suggests an estimated 35.3% (95% credible interval: 33.8% to 36.7%) of adults have been fully vaccinated.
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