"Public Health England medical director Dr Yvonne Doyle says it is still not "absolutely clear" the new variant caused more death.
"There is some evidence, but it is very early evidence. It is small numbers of cases and it is far too early to say this will actually happen," she tells BBC Radio 4's Today programme.
And Dr Mike Tildesley, a member of Sage subgroup the Scientific Pandemic Influenza Group on Modelling (Spi-M), agrees with Dr Doyle.
He says it is still too early to be drawing "strong conclusions" based "on a relatively small amount of data".
"I just worry that where we report things pre-emptively where the data are not really particularly strong," he tells BBC Breakfast."
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