The head of the World Health Organization (WHO) said on Monday that it would be dangerous to assume that the highly permeable omicron was the last variant to emerge and that the world was in the 'end game' of the pandemic. However, Tedros Adhanom Ghebreyesus said this year it was possible to exit the acute phase of the pandemic where COVID-19 constitutes a global health emergency if strategies and tools such as tests and vaccines are used widely.