Speaking at a Downing Street press conference, Mr Johnson said that in the absence of a vaccine the "only real utensil" available in controlling the disease was "human behaviour".
Today, the weekly survey by the Office for National Statistics reports that the prevalence of the virus in the community in England is likely to be rising for the first time since May...
"I've said throughout the pandemic that there would be fresh outbreaks", Johnson said at a news conference, the morning after his government tightened restrictions for four million people across a swathe of northern England. "We will come down hard on people who are not doing the right thing".
Measures due to be lifted tomorrow, including small wedding receptions and reopening bowling alleys and casinos, have been postponed for at least two weeks.
He said: "I think what we're seeing from the data from ONS and other data is that we have probably reached near the limit or the limits of what we can do in terms of opening up society. I am really, really sorry about that but we simply can not take the risk". We know that employers have gone to huge lengths to make workplaces safe, so that guidance remains unchanged. "So what that means potentially is that if we wish to do more things in the future, we may have to do less of some other things", he said.More news: Manchester City close to snapping up star winger Ferran Torres
He also urged the country to be "focused" and that people could not be "complacent" amid efforts to control the pandemic.
"And so you're totally right, we need to keep it as simple as we possibly can and that's why, to sum it up in a nutshell, is: hands, face, space".
"We now recommend face coverings are worn in these settings, and this will become enforceable in law from August 8".
Johnson said the government will extend the requirement to wear a face covering to other indoor settings where people are likely to come into contact with others they do not normally meet, such as museums, galleries, cinemas and places of worship.
He stated: "At this stage, we are not changing the rules on social contact nationally".More news: Premier League wanted Saudi state to become Newcastle United director, says investor
Speaking at the briefing, he said: "All my happiest holiday memories are of holiday vacations here in the United Kingdom, bucket-and-spade jobs or whatever, and I thoroughly, thoroughly recommend it, and I'm sure that people will have a great time over the summer".
The new rules, which also apply to the city of Leicester in the East Midlands, allow people from these neighborhoods to still go to bars and pubs, but "two households should not go to hospitality together".
And of course we continue to hope for the best.
As cases rose across Asia and Latin America, he said that "we can't fool ourselves that we're exempt" from essential lockdown measures to effectively contain the virus.More news: Supreme Court Justice Ginsburg receives treatment in New York hospital