On Tuesday, the director of the World Health Organization (WHO) warned countries against lifting their Wuhan coronavirus restrictions, claiming that the virus “continues to evolve” and that vaccines alone are not the answer.

WHO Director-General Tedros Adhanom Ghebreyesus made the remarks to reporters during a press briefing on Tuesday. He emphasized that while he did not believe countries needed to return to lockdowns, he said that countries could not rely on vaccines to solve the pandemic.

“We’re concerned that a narrative has taken hold in some countries that because of vaccines, and because of omicron’s high transmissibility and lower severity, preventing transmission is no longer possible and no longer necessary,” Ghebreyesus said during the briefing. “Nothing could be further from the truth.”