Men wearing protective suits are seen outside a future temporary COVID-19 vaccination unit, amid the coronavirus disease outbreak in Sofia, Bulgaria, December 15, 2020. REUTERS/Stoyan Nenov/Files

Bulgaria's tally of coronavirus infections has risen by 6,813 in the past 24 hours, a record daily increase as the European Union's least vaccinated country grapples with a fourth wave of the pandemic, official data showed on Wednesday.

Iran PressEurope: Reuters reported that the virus has killed 124 people in the past 24 hours, according to the figures, bringing the total death toll to 23,440.

Worldwide deaths related to COVID-19 surpassed 4.8 million on Monday, October 4, 2021, according to Worldometer.

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