Lockdown in Madrid. (c) Koen Greven

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

Many western countries, 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 time), and a further 353,085 individuals had not been advised to shield but were categorised by the researchers as at medium risk of Covid-19 due to health conditions such as diabetes.

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    More infections

    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 infection.

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

    Limited value

    “Our study also showed that shielding may be of limited value in reducing burden on health services 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, ‘Comparison of COVID-19 outcomes among shielded and non-shielded populations,’ is published in Scientific Reports.

    Read also: Psychological consequences of the lockdown may be much more severe than thought

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    About the author

    Author profile picture Arnoud Cornelissen has for many years been writing about science and technology in, among others, various Dutch newspapers.