Four suspected Omicron cases in Mansfield and Ashfield
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Suspected cases are specimens found to be without a marker called the S-gene, which is missing in Omicron cases but present in Delta cases.
The data covers the period up to December 6.
The actual number of cases across the country is believed to be much higher.
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Prof Eleanor Riley, professor of immunology and infectious disease at the University of Edinburgh, said Omicron appeared to be so infectious that ‘you have to work on the basis that anyone you come into contact with has it’.