First up, an error on my part, the 38% figure represented the number of deaths in English care homes due to Covid-19, not 38% of care homes that had Covid cases. The proportion of care homes that had had Covid-19 cases on the 29th April was 33%
https://www.independent.co.uk/news/...-cases-covid-19-deaths-pandemic-a9490276.html
As of the latest report the proportion of care homes that have had Covid-19 cases is now 56%
https://www.independent.co.uk/news/...eaths-rate-england-wales-latest-a9599426.html
As you have stated this is the level reported throughout Europe at the end of April to everyone's horror.
But the sad fact is that in the last two months this percentage in England has gone up 23% even WITH additional measures in place. Testing for residents and staff has been available on demand and access to PPE provided (no issues from the last week in May) . Best practice processes have been enforced, yet the numbers have continued to rise.
The use of agency staff is clearly one of the major issues by staff members visiting multiple homes and asymptomatic transmission is another cause - the introduction of regular testing regardless of symptoms finally appears to have got a grip of things but somthing has still gone badly wrong. No wonder Boris and other government ministers have been tearing their hair out.
Private care homes seem to have been the least badly effected. The big care corporations clearly are the main problem.