Public Health Scotland has said it "cannot rule out" a link between patients being discharged from hospital and Covid outbreaks in care homes, APA reports citing BBC.
It found mortality was high, with Covid associated with 21.6% of deaths within 30 days of discharge to a care home.
More than 5,000 patients were sent to care homes between 1 March and 31 May last year - many without a test.
This report follows an earlier PHS study that was criticised for not being clear on its findings.
The health body said the size of a care home was still the biggest factor in the risk of an outbreak.