The UK is "not retired of the woods yet" and radical should enactment with caution arsenic Covid restrictions successful England extremity connected Monday, Prof Chris Whitty has said.
The main aesculapian advisor warned that infirmary admissions were doubling each 3 weeks and could deed "scary numbers" if the inclination continues.
Prof Whitty said the pandemic inactive had a "long mode to tally successful the UK".
It comes arsenic the UK recorded astir 50,000 caller cases connected Thursday - the highest regular fig since January.
Prof Whitty told an online seminar hosted by the Science Museum connected Thursday evening: "I don't deliberation we should underestimate the information that we could get into occupation again amazingly fast."
He added: "We are not by immoderate means retired of the woods yet connected this, we are successful overmuch amended signifier owed to the vaccine programme, and drugs and a assortment of different things.
"But this has got a agelong mode to tally successful the UK, and it's got adjacent further to tally globally."
He said portion the fig of radical successful infirmary with Covid-19 astatine the infinitesimal was "mercifully overmuch little than it was previously", helium insisted the fig was "not trivial".
"We've inactive got implicit 2,000 radical successful infirmary and that fig is increasing," helium said.
But Prof Whitty said the cardinal connected 19 July was "to instrumentality things incredibly slowly" - adding that helium afloat anticipated astir radical would inactive instrumentality precautions.
"If you look implicit what radical person done, and successful information if you look astatine what radical mean to bash now, radical person been incredibly bully astatine saying, 'I whitethorn beryllium a comparatively debased risk, but radical astir maine are astatine precocious risk, and I'm going to modify my behaviours'," helium said.
From 19 July, almost each ineligible restrictions connected societal interaction volition beryllium removed successful England, but immoderate guidance volition remain. Different rules use successful the the remainder of the UK.
Nightclubs volition beryllium allowed to reopen for the archetypal clip since March past twelvemonth and capableness limits volition beryllium removed for each venues and events.
There volition nary longer beryllium immoderate limits connected however galore radical tin conscionable and the 1m-plus distancing regularisation volition besides end.
The ineligible request to deterioration look coverings successful immoderate enclosed nationalist places volition expire, but Health Secretary Sajid Javid has antecedently said masks would inactive beryllium "expected and recommended" successful crowded indoor areas.
But the UK's 2 largest supermarkets - Tesco and Sainsbury's - have said they volition proceed to inquire shoppers to deterioration masks from Monday to support unit and shoppers.
Prof Whitty predicted that successful the mean term, coronavirus could mutate into a "vaccine flight variant" that could instrumentality the UK "some of the mode backwards" into the worst days of the pandemic.
"The further retired successful clip we go, the much tools we person astatine our disposal from science, the little apt that is but you tin ne'er instrumentality that anticipation wholly disconnected the table," helium said.
"But you know, subject has done a phenomenal occupation truthful acold and it volition proceed to bash so."
Prof Whitty's latest comments echo his statements astatine Monday's Downing Street coronavirus briefing wherever Prime Minister Boris Johnson confirmed the last signifier of unlocking successful England would instrumentality spot connected 19 July.
The main aesculapian serviceman said the "overwhelming view" of the technological assemblage was that moving "slowly" done the adjacent measurement of easing restrictions was "essential".
He added that portion the numbers of radical being admitted to infirmary with Covid were "not trivial", they were rising astatine a overmuch little complaint than erstwhile waves.
On Thursday, the UK recorded caller 48,553 caller infections and a further 63 deaths wrong 28 days of a affirmative test.
It comes arsenic more than fractional a cardinal self-isolation alerts were sent to radical utilizing the NHS Covid-19 app successful England and Wales during the archetypal week of July - a 46% emergence connected the erstwhile week.
Firms including Nissan and Rolls-Royce person warned production could beryllium affected owed to precocious numbers of unit being told to isolate by the NHS Test and Trace app.