During a call with reporters on Monday, White House senior administration officials discussed a controversial declaration written by some scientists that advocates for ending lockdowns, building immunity and pushing for those who are not vulnerable to Covid-19 to resume normal life.
Yet many experts warn that the idea to allow the novel coronavirus to circulate freely — also known as a “herd immunity” approach — is dangerous.
World Health Organization Director-General Tedros Adhanom Ghebreyesus has even called it “unethical.”
Tedros explained that herd immunity is a “concept used for vaccination,” not pandemic control.
“Never in the history of public health has herd immunity been used as a strategy for responding to an outbreak, let alone a pandemic. It is scientifically and ethically problematic,” Tedros said. “Letting the virus circulate unchecked, therefore, means allowing unnecessary infections, suffering and death.”
Such an approach — similar to what was pursued in Sweden — would mean that many people nationwide would have to get sick with the coronavirus in order to build up a natural immunity across communities. As the virus spreads and sickens people, many could die in the process.
Atlas explicitly denied that he is pushing a herd immunity strategy, but an administration official told CNN all of the policies Atlas has pushed for are in the vein of a herd immunity strategy.
Atlas has rejected the need for widespread community testing, arguing that the administration should focus almost exclusively on protecting and testing elderly populations while pushing for the rest of the economy to return to normal, this official said.
“Everything he says and does points toward herd immunity,” the senior administration official said.
About 2 million Americans could die in the effort to achieve herd immunity to the coronavirus, Dr. Leana Wen, emergency physician and CNN medical analyst, said in late August.
Wen told CNN’s Brianna Keilar that she has “huge concerns” about a herd immunity approach and much is still unknown about how long immunity to Covid-19 might last.
“If we’re waiting until 60% to 80% of people have it, we’re talking about 200 million-plus Americans getting this — and at a fatality rate of 1%, let’s say, that’s 2 million Americans who will die in this effort to try to get herd immunity,” Wen said. “Those are preventable deaths of our loved ones that we can just not let happen under our watch.”
“Normally when we talk about herd immunity, we talk about how much of the population needs to be vaccinated to have immunity to the virus, to the pathogen, so that transmission can no longer take place or it’s very difficult for a virus or a pathogen to transmit between people,” Van Kerkhove said.
“If we think about herd immunity in the natural sense of just letting a virus run, it’s very dangerous,” she said. “That means that many people are infected, many people will need hospitalizations and many people will die.”
Sweden’s ‘herd immunity’ efforts
Herd immunity refers to a specific threshold of protection needed for a certain population or community to have against an infectious disease to keep it at bay — and that protection can come from either prior infections or vaccination, Dr. Amesh Adalja, senior scholar at the Johns Hopkins University Center for Health Security, told CNN in late August.
“If a herd immunity threshold has been crossed, it is very difficult for an infectious disease to be able to find new people to infect and to sustain transmission in that community,” Adalja said, adding that when it comes to Sweden, “it doesn’t seem like the herd immunity threshold was crossed there, from all we can tell.”
The number of deaths per million in the country is much higher than some of its closest neighbors, with similar low population densities, namely Denmark at 107.73, Finland at 60.46, Norway at 48.7 or Estonia at 48.25.
“It is likely that some of this inter-Scandinavian difference in mortality outcomes might have also have arisen from a failure to shield the most vulnerable Swedes from viral infections (40%–50% of their cases have been in the elderly nursing home resident population),” Orlowski and Goldsmith wrote. “But as with other aspects of this unparalleled crisis, more time is needed to understand the many lasting impacts.”
Much of the criticism around Sweden’s response has focused on the high death rates in care homes.
“It’s not obvious how to completely isolate those people that are at risk for severe disease from those who generally get mild disease,” Adalja said.
Sweden’s chief epidemiologist Anders Tegnell admitted in June that the country’s Public Health Agency “didn’t know that there would be such a big potential for the disease to spread in elderly care homes, with so many deaths.”
But he told Swedish newspaper Dagens Nyheter: “There are things that we could have done better but in general I think that Sweden has chosen the right way.”
“In Sweden, Anders Tegnell and the team there have done a good job,” Ryan said.
“That is the way in which Swedish people and the Swedish government interact. That is the social contract in Sweden,” he said. “Nobody has come through this pandemic with a perfect strategy.”
‘Instead of pushing for herd immunity, the U.S. must double down’
“Swedish government officials initially sought to let the virus run largely unchallenged in the general population while taking steps to protect the elderly. The Swedish view was that the country could reach herd immunity without jeopardizing the economy. But holding up Sweden as an enlightened model misreads important parts of its experience,” Gottlieb wrote in the op-ed.
“Many Swedes pulled back from normal activities to shelter themselves from infection anyway, even younger and middle-aged people. The country experienced 5,821 Covid deaths in a population the size of North Carolina. And Sweden is far short of herd immunity, even as the country’s economic recovery ranks among the worst in its region,” Gottlieb wrote in part. “Confronting a dangerous pandemic requires containing spread wherever it is reasonably possible.”
He went on to note that wearing masks, testing for Covid-19, and tracing the contacts of people who have it remain helpful.
“Sweden’s attempt to create ‘herd immunity’ has been woefully unsuccessful and is definitely not a strategy we should seek to replicate in the United States,” Dr. Howard Koh, former assistant secretary for health under President Obama and professor at the Harvard T.H. Chan School of Public Health, said in an email to CNN in late August.
“What’s more, pushing for ‘herd immunity’ now would completely upend the months of work the U.S. has done so far in efforts to control the virus,” Koh said in part. “Instead of pushing for herd immunity, the U.S. must double down on the public health tools at our disposal — including universal mask wearing, widespread testing, and contract tracing — until a vaccine and more effective therapeutics become available.”
Editor’s Note: This article, originally published on September 1, has been updated to reflect recent news events and the latest number of cases and deaths in Sweden.