The NHS test-and-trace system was officially launched on 28 May.
In the first two weeks, 14,045 people who tested positive for coronavirus were referred to the contact-tracing system, according to official government figures.
Tracers only managed to make contact with less than three quarters - or 10,192 - of the people referred to the service in the two weeks to 10 June.
People with a confirmed case are contacted via text, email or phone call, and are then asked to share the details of their close contacts.
A close contact is someone who has been within 2m of an infected individual for more than 15 minutes.
Of the 96,746 people identified as having had close contact with those testing positive, 90% - or 87,639 - were reached and asked to self-isolate.
And 86% of the recent contacts advised to self-isolate by the NHS service were reached within the first 24 hours.
The test-and-trace service does not handle contact tracing for all confirmed cases. Where a significant outbreak has occurred, it is followed up by local public health teams instead.
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