some form or another", a member of the government's Scientific Advisory Group for Emergencies (Sage) has said.
Sir Mark Walport said people would need to be vaccinated at regular intervals.
His commen
ts come after the head of the World Health Organization (WHO) said he hoped the pandemic would be over within two years , as the Spanish flu had taken two years to overcome.
Sir Mark said denser populations and travel meant the virus spread easily.
He also said the world population was now much larger than in 1918.
Speaking to BBC Radio 4's Today programme, Sir Mark said that, in order to control the pandemic, "global vaccination" would be required, but coronavirus would not be a disease like smallpox "which could be eradicated by vaccination".
If COVID-19 never ends, it means COVID-19 will become a human disease like AIDS.