The World Health Organization is monitoring a new variant with numerous mutations to the spike protein, scheduling a special meeting Friday, November 26 to discuss what it may mean for vaccines and treatments, officials said Thursday, CNBC reports.

The variant, called B.1.1.529, has been detected in South Africa in small numbers, according to the WHO.

“We don’t know very much about this yet. What we do know is that this variant has a large number of mutations. And the concern is that when you have so many mutations, it can have an impact on how the virus behaves,” Dr. Maria Van Kerkhove, WHO’s technical lead on Covid-19, said in a Q&A that was livestreamed on the organization’s social media channels.

The monitoring of the new variant comes as Covid cases surge around the world heading into the holiday season, with the WHO reporting hot spots in all regions and particularly in Europe.

South African scientists have detected more than 30 mutations to the spike protein, the part of the virus that binds to cells in the body, South African scientist Tulio de Oliveira said in a media briefing hosted by the South Africa Department of Health on Thursday.