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A sports centre in Bangor is being turned into a field hospital - in just 16 days.
Bangor University scientists are coming together to find ways to monitor the spread of coronavirus.
Davey Jones, of the school of natural sciences, said an accurate estimation of infection spread would be "valuable information" for those trying to control the outbreak.
"While the number of hospitalisations of Covid-19 cases provides some measure of the disease within the population, it provides no reliable information on mild infections and carriers who show no symptoms,” he said.
The research group are going to test sewage to give an indicator of disease incidence.
"This is particularly suitable as most UK urban centres are served by only one or two waste water treatment works, providing a single integrated signal of millions of people in a single sample," Dr Jones said.
A temporary hospital with about 250 beds for patients with Covid-19 symptoms is being set up at Bangor University.
Sports and leisure facilities are being used in a partnership between the university and Betsi Cadwaladr University Health Board.
Health board chairman Mark Polin said: “The development of temporary hospitals like this are central to our plans to achieve the additional capacity we need, alongside developing additional space within our hospitals.
“I would like to assure the public that the preparatory work on identifying suitable sites has been underway for some time and is now moving at considerable pace.
“We are assessing sites in Flintshire and Wrexham where a third temporary hospital will be developed.”
Venue Cymru in Llandudno will also be converted to hold an additional 350 temporary beds, and construction work on a further 80 beds is currently taking place at Glan Clwyd Hospital.