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The World Health Organization said Wednesday that 23 countries across the world have reported cases of the highly mutated omicron Covid-19 variant. From a report: "At least 23 countries from five of six WHO regions have now reported cases of omicron and we expect that number to grow," WHO Director-General Tedros Adhanom Ghebreyesus told reporters during an update Wednesday in Geneva. "WHO takes this development extremely seriously and so should every country. But it should not surprise us," Tedros continued. "This is what viruses do. And it's what this virus will continue to do, as we long as we allow it to continue spreading." The new number comes one day after White House chief medical advisor Dr. Anthony Fauci said 226 cases of the variant have been detected across 20 countries. Officials have not confirmed a case in the U.S. yet. The variant, which was reported to WHO by South Africa a week ago, has more than 30 mutations to the spike protein alone. Some of the mutations are associated with a decrease in antibody protection and higher transmission, according to the WHO. Tedros said there is still more to learn about the new variant's effect on transmission, the severity of disease and the effectiveness of tests, therapeutics and vaccines. Several WHO advisory groups have met in the last few days to "evaluate the emerging evidence, and prioritize the studies needed to answer these questions," he said.