The borough of Blackburn with Darwen in Lancashire has a rate of 79.2 Covid-19 cases per 100,000 in the seven days to July 17, according to the latest data from Public Health England (PHE).
Leicester has a rate of 77.7 per 100,000 people over the same period.
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The local council introduced new measures warning the public to reduce household visiting to one household plus two members from another household, to wear face masks in all public spaces and asked people not to hug or shake hands on greeting.
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The local authority also increased inspections on small corner shops and ramped up testing with mobile testing units and targeted testing sites.
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A mobile testing centre at Witton Park High School in Blackburn and Darwen
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Infection rates are expected to rise as more testing is done, before they fall back again.