PARIS (AFP) - Roughly a year into the pandemic it is clear the new coronavirus is worse than seasonal flu, and a study released on Friday outlined just how much worse, showing a death rate almost three times higher among Covid-19 patients.

The research, using French national data and published in the journal The Lancet Respiratory Medicine, underscored the increased severity of illness for people with Covid-19.

Researchers compared data for 89,530 patients hospitalised with Covid-19 in March and April this year with 45,819 patients hospitalised with seasonal influenza between December 2018 and the end of February 2019.

Some 16.9 per cent of Covid-19 patients died during the period of study - which was during a devastating first wave across Europe when doctors had few therapies to turn to for severely ill people.

This compares to a death rate of 5.8 per cent among those with influenza.

Catherine Quantin, a professor at the University Hospital of Dijon and the French national health institute Inserm who jointly led the study, said the difference in death rates was "particularly striking" given the 2018/19 flu season was the deadliest France had seen in five years.

The authors note that the difference in the number of hospitalisations - which saw twice as many people admitted for Covid-19 than flu - may be partly explained by existing immunity to influenza, either because of previous infection or vaccination.

Researchers found that more patients with Covid-19 needed intensive care - 16.3 per cent compared with 10.8 per cent for influenza - while the average stay in ICU was nearly twice as long (15 days compared to 8 days).

The study also reported far fewer children under 18 hospitalised with Covid-19 than with flu - 1.4 per cent compared to 19.5 per cent.