A quarter of people who test positive for coronavirus are still not being contacted by contact tracers, new figures have shown.
A total of 27,125 people who tested positive for Covid-19 in England had their case transferred to the NHS Test and Trace contact tracing system during the first four weeks of its operation, according to figures from the Department of Health & Social Care.
Of this total, 20,039 people (74%) were reached and asked to provide details of recent contacts, while 6,245 people (23%) were not reached.
A further 841 people (3%) could not be reached because their communication details had not been provided.
The statistics cover the period May 28 to June 24.
They also suggested Boris Johnson’s promise of all test results being returned within 24 hours by the end of June was unlikely to be reached.
Just over 60% of people tested by mobile testing units, which travel around the country to increase access to testing including at care homes and prisons, received their results within 24 hours in the latest figures.
Between June 17 and June 24, 22,658 people (60.6%) received their test results within 24 hours of taking a test.
14,014 people (37.5%) received results between 24 and 48 hours later.
37,365 people were tested at mobile testing units in the same period.
1.3% of tests were not completed and 0.2% of results were received in more than 72 hours.
Between May 28 and June 3, 2,311 people (4.6%) received their results within 24 hours of taking the test with the majority (87%) receiving results between 24 and 48 hours later.
Less than a quarter of tests taken at satellite test centres returned results within 24 hours of taking the test, the Department of Health figures show.
In the period between June 18 to June 24, 12,717 (21.5%) test results were received within 24 hours, with 40,773 (68.8%) received within 48 hours.
Between May 28 and June 3, 6,191 (6.4%) test results were received within 24 hours.
During the first four weeks of Test and Trace, 132,525 people who had been identified as recent close contacts of people who had tested positive for Covid-19 were reached through the tracing system and asked to self-isolate.
This was 86% out of a total of 153,442 identified contacts.
The remaining 20,917 people (14%) were identified as close contacts, but were not reached.
Some of these people could not be reached because no communication details had been provided for them.