In the past, Kelly assumed a leadership role in the FluCAN project,[5] a national system used to track people hospitalised with influenza, which helps to determine the efficacy of the flu vaccine.[3]
On 22 December 2020, Kelly was officially appointed to the role of Chief Medical Officer on a permanent basis, having previously served in an acting capacity.[6]
In 2022, Kelly reportedly advised against instituting mandatory COVID-19 tests for travellers from China, though the advice was ignored in favor of adopting a policy more in-line with other countries around the world, including the United States, France, and the United Kingdom.[7]