Prime Minister Boris Johnson has joined more than 20 world leaders in calling for a new global settlement to help the world prepare for future pandemics.
In a newspaper article the leaders, including the German chancellor and French president, said Covid posed the biggest challenge since World War Two.
The pandemic has shown "nobody is safe until everyone is safe", they said.
Writing in the Daily Telegraph and publications such as Le Monde in France and El Pais in Spain, the 24 leaders argue that a treaty similar to that reached in the wake of World War Two is needed to build cross-border cooperation.
The signatories, who include the head of the World Health Organization, Dr Tedros Adhanom Ghebreyesus, said: "At that time, following the devastation of two world wars, political leaders came together to forge the multilateral system.
"The Covid-19 pandemic has been a stark and painful reminder that nobody is safe until everyone is safe".
The letter added: "At a time when Covid-19 has exploited our weaknesses and divisions, we must seize this opportunity and come together as a global community for peaceful co-operation that extends beyond this crisis".
