![Boris Johnson is among the world leaders who signed a letter calling for an international treaty to tackle future pandemics. Reuters](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/TOWRZZA4N6JBDIR2NWGSAOQ7X4.jpg?smart=true&auth=ec8aa093a102b95cd4597718a25026472d17f6d22f168e73e6b2c33765e36771&width=400&height=225)
Boris Johnson is among the world leaders who signed a letter calling for an international treaty to tackle future pandemics. Reuters
Boris Johnson is among the world leaders who signed a letter calling for an international treaty to tackle future pandemics. Reuters
World leaders call for global treaty to tackle future pandemics
Boris Johnson and more than 20 leaders say another crisis is a matter of 'not if, but when'