Bulgaria has reported a record 11,181 coronavirus infections in a single day in the last 24 hours, official data shows, dominated by the more contagious Omicron variant.

The European Union nation, where less than 30 per cent of the population of seven million has been vaccinated, added 91 deaths.

Reuters reports Bulgaria's tally of infections exceeds 840,000, with 32,332 deaths since the pandemic began.