Shielding highest-risk people during the first wave of the pandemic not as effective as hoped

elderly mask
Credit: Pixabay/CC0 Public Domain

Shielding those at highest risk from COVID-19 during the first wave of the pandemic may not have been as effective at protecting them from infection and death as hoped, according to a new study.

The research—led by the University of Glasgow and published in Scientific Reports—found that, between March and May 2020, patients advised to in NHS Greater Glasgow and Clyde (NHSGGC) experienced higher rates of infection and death than those not advised to shield.

Many , including Scotland, used shielding (extended self-isolation) of people presumed to be at high-risk from COVID-19 to protect them and reduce healthcare demand.

The study looked at data from over 1.3 million patients registered with GP practices in NHSGGC. Of this group, 27,747 individuals had been advised to shield (self-isolate for extended periods of ), and a further 353,085 individuals had not been advised to shield but were categorized by the researchers as at medium risk of COVID-19 due to such as diabetes.

The authors found that, compared to low-risk individuals (the remaining 934,239 people in the study), people who had been advised to shield were eight times more likely to have confirmed infections.

Those advised to shield were also five times more likely to die following confirmed infection, whilst moderate-risk individuals were four times more likely to have confirmed infections than the low-risk group, and five times more likely to die following confirmed .

In the shielded group, there were 299 (1.1%) confirmed infections and 140 (0.51%) deaths from COVID-19. In the moderate risk group, there were 1,859 (0.53 %) confirmed infections and 803 (0.23%) deaths; and in the low-risk group, there were 1,190 (0.13% confirmed infections) and 84 (0.01%) deaths from COVID-19.

The study also showed that an age of 70 and over accounted for 49.55% of deaths.

Professor Jill Pell, Director of the University of Glasgow's Institute of Health and Wellbeing, said: "Our study highlights that to effectively protect high-risk individuals, shielding should be used alongside other population-wide measures such as physical distancing, face coverings and hand hygiene.

"Our study also showed that shielding may be of limited value in reducing burden on because, in spite of the shielding strategy, high risk individuals were at increased risk of death. We believe that, to be effective as a population strategy, shielding criteria would have needed to be widely expanded to include other criteria, such as the elderly."

The study linked GP, prescribing, laboratory, hospital and records and compared COVID-19 outcomes among shielded and non-shielded individuals in the West of Scotland.

The study, "Comparison of COVID-19 outcomes among shielded and non-shielded populations," is published in Scientific Reports.

More information: Bhautesh D. Jani et al, Comparison of COVID-19 outcomes among shielded and non-shielded populations, Scientific Reports (2021). DOI: 10.1038/s41598-021-94630-6

Journal information: Scientific Reports
Citation: Shielding highest-risk people during the first wave of the pandemic not as effective as hoped (2021, July 27) retrieved 19 March 2024 from https://medicalxpress.com/news/2021-07-shielding-highest-risk-people-pandemic-effective.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Explore further

New research finds 'substantial differences' in who was asked to shield from COVID-19

180 shares

Feedback to editors