A key factor in the spread of Covid-19 in schools is symptomless cases. Most scientists believe that between 30% and 40% of adults do not display any Covid symptoms on the day of testing, even if they have been infected. For children, however, this figure is higher.
"It is probably more like 50% for those in secondary school while for boys and girls in primary school, around 70% may not be displaying symptoms even though they have picked up the virus," says Professor Michael Hibberd of the London School of Hygiene and Tropical Medicine.
That is a large proportion of symptom-free disease-carriers within a population. What is not yet known is just how much infection is being passed on by this cohort of young symptom-free carriers. It is a critically important issue, and one that will play a key role in determining the effect of Covid-19 on the people of Britain in the next few weeks, say researchers.
One solution to the problem is to increase testing in schools. This would require the widespread deployment of rapid testing, particularly with the lateral flow method, which is easily administered and gives results in less than half an hour. It is less accurate than the standard PCR swab test, however, and there have been concerns about a high level of false negative results leading to the continued spread of the new, more infectious, variant of the coronavirus.
Symptomless cases in schools could be key driver in spread of Covid-19
Up to 70% of schoolchildren infected with coronavirus may not know they have it until after a positive test result
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