Adults in hospital who have COVID-19 and the flu at the same time are at much greater risk of severe disease and death compared with patients who have COVID-19 alone or with other viruses, research shows.

Patients with co-infection of SARS-CoV-2, which causes COVID-19, and influenza viruses were over four times more likely to require ventilation support and 2.4 times more likely to die than if they only had COVID-19, experts found.

Researchers say the findings show the need for greater flu testing of COVID-19 patients in hospital and highlight the importance of full vaccination against both COVID-19 and the flu.

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