A Covid outbreak at a Norwegian party last November is the basis for a study showing how there are eight key symptoms of how the Omicron variant of the virus affects those who are fully-vaccinated.
Though UK Covid-19 rates have fallen dramatically in recent weeks - it's unclear how much of this fall is due to the end of free mass testing from April 1 - there are still thought to be thousands of people contracting the virus. And many of those people are fully-vaccinated.
The various Covid-19 vaccines provide strong protection against severe illness, but this wanes and does not always protect someone from catching the virus. And booster jabs have been needed to renew protection. Researchers in Norway have focussed on one shocking house party in the Scandinavian country which led to 81 Covid-19 cases.
