Large numbers of staff could have been unknowingly spreading coronavirus through care homes, according to the UK's largest charitable care home provider.
Data from MHA shows 42% of its staff members who recently tested positive were not displaying symptoms. Nearly 45% of residents who had a positive test were also asymptomatic.
MHA operates in England, Scotland and Wales and has fully tested staff and residents in 86 of its 90 homes so far.
A Department for Health and Social Care spokesperson said: "Our priority is to ensure care workers and those receiving care are protected, and the latest statistics show over 60% of care homes have had no outbreak at all.
"We've set out a comprehensive support package for residents and staff, including a £600m infection control fund, testing regardless of whether you have symptoms, and a named clinical lead to support every care home."
In total, 7% of MHA staff and 13% of residents received a positive test result. Routine testing is not yet under way.
MHA CEO Sam Monaghan told BBC Newsnight: "It is not difficult to imagine that a lot of people may not have ended up dying if we'd had earlier testing and we'd been therefore better able to manage infection control in our homes."
Source: BBC News, 3 June 2020