England’s top medical officer has warned that the coming winter will continue to be difficult for the country’s health system despite the country’s successful coronavirus vaccination program.

A further easing of lockdown restrictions in England was delayed this week due to a surge in cases of the delta variant first discovered in India.

In a speech to the NHS Confederation Thursday, Chief Medical Officer Chris Whitty said the current wave of Covid infections due to the delta variant would likely be followed by another surge in the winter.

He said that Covid-19 “has not thrown its last surprise at us and there will be several more [variants] over the next period,” according to Sky News. He added that it would likely take five years before there are vaccines that could “hold the line” to a very large degree against a range of coronavirus variants.

And until then, he said that new vaccination programs and booster shots would be needed.

Flourish logoA Flourish chart
In the U.K., where the delta variant is now responsible for the bulk of new infections, cases have spiked among young people and the unvaccinated, leading to a rise in hospitalizations in those cohorts.

It’s hoped that Covid-19 vaccination programs can stop the spread of the delta variant and so the race is on to protect younger people who might not be fully vaccinated