Lecturers say cases may soar as students move in, but ministers insist institutions are prepared.
Contingency plans include part-time secondaries and whole year-groups sent home where cases confirmed.
A study from South Korea gives among the clearest pictures yet of children as carriers of the virus.
A leaked government report suggests a “reasonable worst case scenario” of 85,000 Covid deaths this winter.
The figures are based on tests on people in their homes, whether they have symptoms or not.
Figures also show 14 Welsh communities have not registered any deaths involving Covid-19.
They would include midwives, physiotherapists and possibly even dentists, the government says.
Severe Covid-19 is rare and dying from it exceptionally rare, a study of UK hospital data finds.
There's to be a new effort to understand how the immune system responds to Covid-19.
A phenomenon called parosmia has left coronavirus survivors trapped in a world of distorted scents.
The number of new positive test results has risen to 1,522 in the past 24 hours.
Guidance has changed but the Welsh government says that reflects low infection rates.