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Ski slopes in Poland, such as this one in Szczyrk, reopened last Friday Image caption: Ski slopes in Poland, such as this one in Szczyrk, reopened last Friday

The South African variant of coronavirus has been detected in Poland as the health minister Adam Niedzielski confirmed a third wave has arrived in the country.

The first case of the variant was discovered near the city of Suwalki in north-eastern Poland, Niedzielski says. About 10% of Covid-19 cases in Poland are now the UK variant.

Niedzielski says there has been a very dynamic increase in new infections in the past two weeks.

"Looking at the results it must be said that the third wave of the pandemic is already in Poland," he tells a news conference.

The seven-day average this week exceeded 6,500 cases, he says, 1,000 more than in previous weeks. He also says the number of patients requiring hospital treatment, which had been decreasing, has reversed in the past week.

The trend reversal comes just a week after Poland allowed ski slopes to reopen, as well as hotels, cinemas and theatres reopening at half capacity. Officials have said restrictions would be reinstated if cases rise significantly.

On Friday, Poland reported 8,777 new cases in the previous 24 hours and 241 virus-related deaths. The number of new daily cases this week has been the highest in more than a month.

Poland has vaccinated 2.56 million people, equivalent to 6.8% of the population, including 865,884 people who has received both doses, or 2.3% of the population.