Nearly 2,000 close contacts of people with coronavirus were not contacted by or did not respond to the Test and Trace regime in Hertfordshire.

This equates to more than a third of contacts not being reached in the county, figures suggest.

It comes as NHS Test and Trace recorded its worst performance on record for the proportion of contacts traced, with health chiefs warning "prompt action" is needed to prevent a tide of hospitalisations as cases increase nationally.

Data from the Department for Health and Social care shows 2,259 people who tested positive for Covid-19 in Hertfordshire were transferred to the Test and Trace service between May 28 and September 30.

Test and Trace asks these patients to give details for anyone they were in close contact with in the 48 hours before their symptoms started.

Read more: Local contact tracing system goes countywide

In Hertfordshire, 5,714 close contacts were identified – also referred to as "non-complex" cases, meaning they could be dealt with through a call centre or online.

But just 66 per cent of those were reached by contact tracers in the four month period, meaning 1,960 people were not contacted or did not respond.

That meant there was no increase on the 65.7 per cent reached in the period to September 23. It was among the highest proportions across the East of England, where 63 per cent of contacts were reached on average.

The NHS Test and Trace system was launched in Hertfordshire in June.

At the beginning of October, we reported that a new localised contract tracing system had been rolled out across Hertfordshire.

It means county council staff will support efforts to locate people who have come into contact with someone who has tested positive for Covid-19.

Watford Observer:

Just two-thirds of close contacts in Hertfordshire were reached in four months. Photo: Radar

A pilot contact tracing initiative has been up-and-running in Three Rivers and Watford since September 15.

Across England 62.4 per cent of non-complex close contacts were reached and told to self-isolate by NHS Test and Trace in the latest week to September 30.

Including complex cases – those linked to settings such as hospitals, schools or prisons – the contact tracing rate was 68.6 per cent, the lowest percentage since test and trace began.

Around 34,500 positive cases were transferred to the system over the period – the highest number since the regime launched in May.

Chris Hopson, chief executive of NHS Providers, said the large increase in positive tests, alongside worsening test and trace performance nationally, is "worrying."

Read more: Test and Trace scheme launched in Hertfordshire - here's how it works

“Trust chief executives across the North West, North East and Yorkshire are telling us that Covid-related hospital admissions are rapidly rising," he added.

“We need prompt action to prevent a full-blown second Covid surge.

"We need every member of the public to play their part – hands, face and space – as they did in the first phase of Covid, however frustrating and burdensome they find any restrictions or public health advice."

There are now 87 local authority contact tracing teams live across the country, with more due in the coming weeks, according to the DHSC.

Baroness Dido Harding, who is interim executive chairwoman of the National Institute for Health Protection, said demand for tests is rising with the growing number of cases.

She said: “We are working hard to increase testing capacity to meet that demand and improve turnaround times for tests.

“We have now opened 500 test sites across the UK, an extraordinary achievement.”