Supermarkets person warned they volition person to chopped opening hours oregon adjacent unopen shops if the fig of workers forced to self-isolate continues to rise.
M&S said the fig of workers being notified by the NHS app is rising exponentially, and it whitethorn person to trim hours if determination are shortages.
A starring supermarket, which declined to beryllium named, said it could pb to monolithic disruption of nutrient supplies.
"And there's a hazard that determination won't beryllium capable unit to unfastened shops."
Last week, implicit 500,000 alerts were sent to users of the NHS Test and Trace app successful England and Wales for the week to 7 July, a emergence of 46% connected the erstwhile week.
M&S main enforcement Steve Rowe told The Times that the fig of radical being forced to self-isolate is "a large contented crossed each manufacture astatine the moment".
He said: "Our Covid cases are astir doubling each week and the pinging level is astir 3 to 1 of Covid cases, truthful we're seeing that increasing exponentially."
He said: "If there's shortages we'll person to negociate it by changing hours of stores, reducing hours."
From 16 August, radical who person been afloat vaccinated volition not person to self-isolate if they are "pinged" by the NHS app erstwhile they person travel into interaction with idiosyncratic who has tested affirmative for Covid. They volition alternatively beryllium advised to instrumentality PCR trial arsenic soon arsenic possible.
But different UK supermarket warned: "The timepiece is ticking and the authorities needs to enactment accelerated to get radical backmost to enactment if they person a antagonistic test.
"If not, we could beryllium heading towards situation constituent adjacent month."
A spokeswoman for Morrisons said: "As per the full of the UK, we are experiencing a emergence successful cases and adjacent interaction notifications."
But she added: "We supply guidance and enactment for colleagues who whitethorn request to self-isolate including sick wage and person Covid unafraid controls successful spot successful each our stores to guarantee we tin proceed to run and support them open. Throughout the full of the pandemic, we person not been required to adjacent a store."
The British Retail Consortium (BRC), which represents the industry, said that the authorities indispensable bring guardant the changes connected self-isolation from 16 August "so that radical who are afloat vaccinated oregon person a antagonistic trial are not forced to needlessly quarantine" erstwhile they are contacted by the app.
BRC main executive, Helen Dickinson, said: "We are already seeing a superior interaction connected retail operations arsenic a effect of unit having to self-isolate and this volition lone get worse close crossed the economy, arsenic cases are already rising accelerated and the last restrictions are eased."
It comes arsenic some the premier curate and the chancellor u-turned connected a determination not to self-isolate aft coming into interaction with wellness Secretary Sajid Javid, who announced connected Saturday that helium had tested affirmative for Covid.
Boris Johnson and Rishi Sunak initially said they planned to support moving connected indispensable authorities concern nether a aviator strategy that involves regular testing.
However, it prompted a backlash by absorption parties arsenic good arsenic the managing manager of the retailer Iceland, Richard Walker, who tweeted: "Shame the hundreds of Iceland unit who've been pinged can't debar self-isolation. We tin each bash a regular lateral travel test."
The rising fig of radical being forced to self-isolate is impacting different sectors. Car-makers Nissan and Rolls-Royce person some warned that unit shortages could interaction accumulation astatine their plants.
Around 900 workers astatine Nissan's Sunderland works person been sent location aft being told to self-isolate.
Rolls-Royce said it whitethorn person to halve accumulation if much employees are contacted by the Test and Trace app.
Mr Rowe besides said: "Where the manufacture volition spot the symptom is successful the proviso chain, due to the fact that logistics runs choky anyhow to beryllium efficient."
The national Community, which represents steelworkers crossed the UK arsenic good arsenic radical moving successful logistics, said rising cases of coronavirus coupled with unit members having to self-isolate, has led to a deficiency of drivers being capable to work.
"This is causing disruption successful the industry, and reinforces the grounds authorities has been reckless successful its attack to easing restrictions and should reconsider its approach," a spokesperson for Community said.
On Monday, last Covid restrictions volition beryllium lifted successful England, including the ineligible request to deterioration a look disguise successful enclosed spaces.
On Friday, the fig of regular coronavirus cases reported successful the UK surpassed 50,000 for the archetypal clip since mid-January. It recorded 54,674 cases connected Saturday.