GENEVA, Jan 24 (Reuters) - The head of the World Health Organization (WHO) warned on Monday that it was dangerous to assume the Omicron variant would herald the end of COVID-19's acutest phase, exhorting nations to stay focused to beat the pandemic.

"It’s dangerous to assume that Omicron will be the last variant and that we are in the end game," Tedros Adhanom Ghebreyesus told a WHO executive board meeting of the two-year pandemic that has killed nearly 6 million people.

"On the contrary, globally the conditions are ideal for more variants to emerge."

Though Omicron has sent total cases soaring to nearly 350 million, its less lethal impact and the increasing prevalence of vaccines has led to optimism in some parts that the worst of the pandemic may have passed.

Tedros, the WHO's first African head who is running unopposed for a second term, urged discipline and unity in combatting the coronavirus.

"The COVID-19 pandemic is now entering its third year and we are at a critical juncture," he told a news conference earlier. "We must work together to bring the acute phase of this pandemic to an end. We cannot let it continue to drag on, lurching between panic and neglect."