public health england
Health secretary also cast doubt over whether England would return to the tier system.
Before the Covid-19 pandemic hit, the UK was seeing a rise in new diagnoses of gonorrhoea and syphilis.
The same study found past Covid-19 infection provides some immunity for at least five months.
The number of outbreaks has tripled in a month and risen by 60% in the last week, Public Health England data shows.
The government issued guidance on New Year's Eve saying it was "reasonable" for two different vaccines to be given to the same patient if one type was unavailable.
UK tops 40,000 new daily cases – the highest number since pandemic began.
It comes amid warnings that the distribution of the coronavirus jabs could be disrupted if there is a rise in cases following Christmas gatherings.
Over the last five years, flu has killed an average of 11,000 people in England each year.
With the tiers up for review, there are fears these areas could soon face the toughest Covid-19 rules.
Vaccinations will be administered at dozens of hospital hubs from Tuesday.