She says close contacts of a case may not realise they need to be swabbed twice.
It's believed miscommunication is the reason why so many people are not turning up for their covid-19 test.
Up to 1,000 people are missing their scheduled test every day.
Anyone who may be infected is asked to present for two swabs on "day zero" and "day seven" - as the incubation period of the virus is 14 days.
Director of Public Health Medicine Midlands, Dr. Una Fallon, says that regime may be causing confusion and could be communicated better:
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