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Coronavirus

Published: 18th January 2021     

Returning students the reason behind secondary COVID-19 infections across UK, finds study

The study, published in the journal Health Systems, showed that each infected student allowed to return home would produce, on average, 0.94 secondary infections.

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A student infected with Covid-19 returning home from university for Christmas would, on average, have infected just less than one other household member with the virus, a UK-based study suggests. The study, published in the journal Health Systems, showed that each infected student allowed to return home would produce, on average, 0.94 secondary infections.

"With the potential movement of over 1 million UK students for the Christmas vacation, even a modest 1 per cent infection level (meaning 10 in 1,000 students are infected, perhaps many of them without symptoms at the time of travel) would equate to 9,400 new secondary household cases across the country," said researcher Paul R. Harper, Professor at the varsity.

READ ALSO: What the FAQ: COVID Tongue on the rise, what is this rare symptom found in Coronavirus patients?

The researchers at Cardiff University defined an equation to predict the number of secondary household infections using variables for prevalence of the virus, the probability of secondary transmission, the number of household occupants and the total number of students returning home. As the study does not consider transmission to the students' wider home communities or include the journey home -- which may give rise to a larger number of cases, particularly if public transport is taken -- the numbers are a lower bound on the likely impact of transmissions and new cases.

However, although the indicative levels of secondary infections are potentially very large, multiple strategies can be adopted to help reduce the number of students taking COVID-19 home, the authors say. These include strongly advising students not to mix in the days leading up to departure, implementing staggered departure times and facilitating mass testing of students before they head home. The authors have provided computer code and an online app to allow anyone to rerun and adapt the simulations. "The code and app are quick to run with a focus on accessibility so that a user can rapidly change the input probabilities to suit their data, thereby generating their own results based on localised parameters," the researchers said.

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