New 90-minute tests that can detect coronavirus and flu will be rolled out in hospitals and care homes from next week.
The "on-the-spot" swab and DNA tests will help distinguish between Covid-19 and other seasonal illnesses, the government said.
The health secretary said this would be "hugely beneficial" over the winter.
Currently, a third of tests take longer than 24 hours to process.
The announcement comes as the government pushed back a July target to regularly test all care home staff and residents - a key move to identify so-called silent spreaders, those who are infected but do not show symptoms.