Respond to prefers-color-scheme dark in app web views

Follow section front redirects in Spectrum

Enable NLP source in PCS for load testing

Switch off the News Alerts Survey Widget when we have enough responses

Poll to determine if new LUF updates are available

Allows the winning A/B test variant to be turned on without Spectrum deployment

Show infinite scrolling sections in Assembler MultiView

Show option for NLP article summaries in Action Bar

A general feature flag for Recipe Features that aren't yet released

Feature flag for media team features that aren't yet released

Use new Orca video player for preroll plugin in Spectrum

Show the snow tracker (instead of the heat tracker) on Spectrum

The Post endorses April McClain Delaney and Tom Royals for Maryland’s 6th District

On Press Freedom Day, little to celebrate for Hong Kong’s journalists

Young Georgians want to be part of Europe. Their government is in the way.

The new cure-all for vacation excess: the IV drip 

What’s the best bus to New York? We tested 5 for comfort and value.

Adaptive equipment is making national parks more inclusive

Biden confronts campus protests; Trump hedges on accepting election results

Americans are more likely to oppose than support campus protests

The grinding familiarity of the jocks-vs.-hippies proxy fight

Ask Amy: My boyfriend just confessed he’s almost $20,000 in debt

Miss Manners: Is it inappropriate to reach out to old girlfriends?

Carolyn Hax: Longtime friend won’t forgive being last-minute canceled for a guy

In a pinch, the Nationals finally find some offense

The Capitals, a team in transition, know what they want this offseason

Is Pastis as good as our food critic thought? He sent spies to find out.

The New York Times, alone in its outrage over access to Biden

The ‘Access Hollywood’ video cemented Trump’s air of invincibility

Wait, what is Stephen A. Smith talking about? Find out with our quiz.

Trump Media auditor charged by SEC with ‘massive fraud’

Google’s empire is massive. A judge will soon rule if it’s a monopoly.

Five tech products we actually like

Strangers help Sesame Street puppeteer after heirloom necklace was stolen

Teen grabs wheel when driver passes out and school bus veers into traffic

Cat climbed into Amazon return box, found alive 630 miles away

In photos: At least 39 dead as historic flooding hits southern Brazil

Conservatives don't get why Kristi Noem killed her dog

Rooftop rescue of flood victims in Brazil

Confident of victory over Ukraine, Russia exhibits Western war trophies

Northern Gaza is in ‘full-blown famine,’ World Food Program leader says

Two women are seeking Mexico’s presidency. But the race is about a man.

See more coverage in your recommendations

Get the weekly Campaign Moment newsletter

Set alerts for major election developments

Election 2024

The Campaign Moment newsletter

Politics alerts

Amanda Andrade-Rhoades

The Washington Post is providing this news free to all readers as a public service. Follow this story and more by <a href='https://www.washingtonpost.com/newsletters/health-science-environment-alerts/?method=SURL&location=ART&initiative=FREE'>signing up for health, science, and environment email alerts</a>.

The Centers for Disease Control and Prevention <a href="https://www.cdc.gov/mmwr/volumes/71/wr/mm7133e1.htm?s_cid=mm7133e1_w" target=_blank>on Thursday loosened many of its recommendations for battling the coronavirus</a>, a strategic shift that puts more of the onus on individuals, rather than on schools, businesses and other institutions, to limit viral spread.

No longer do schools and other institutions need to screen apparently healthy students and employees as a matter of course. The CDC is putting less emphasis on social distancing — and the new guidance has dropped the “six foot” standard. The quarantine rule for unvaccinated people is gone. The agency’s focus now is on highly vulnerable populations and how to protect them — not on the vast majority of people who at this point have some immunity against the virus and are unlikely to become severely ill.

The new recommendations signal that the Biden administration and its medical advisers have decided that the lower fatality rate from covid-19 in a heavily vaccinated population permits a less demanding set of guidelines.

“The current conditions of this pandemic are very different from those of the last two years,” CDC epidemiologist Greta Massetti said Thursday in a briefing for reporters.

The virus has killed more than 1 million people in the United States since it arrived in early 2020. About 42,000 people with covid are hospitalized and the daily death toll is close to 500, according to a Washington Post seven-day average of daily trends. Those numbers, though quite a bit higher than in early spring, do not approach the dire figures of last winter, and CDC officials have repeatedly pointed to greater protection against the virus because of high levels of vaccine- and infection-induced immunity, coupled with the rollout of effective treatments that have reduced severe illness.

A report released Thursday by the agency explaining the guidance revisions said the more favorable circumstances allow public health officials to focus on “sustainable measures to further reduce medically significant illness as well as to minimize strain on the health care system, while reducing barriers to social, educational, and economic activity.”

When you have covid, here’s how you know you are no longer contagious

But the revision in guidance carries some risk, according to infectious-disease experts: Another fall and winter wave of cases, or the emergence of a new <a href="https://www.washingtonpost.com/coronavirus/" target="_blank" class="contextual_link">coronavirus</a> variant, could call into question the wisdom of the CDC’s strategic pivot or hamper the agency’s ability to reimpose tougher guidelines.

As part of the changes, the agency is dropping its recommendation that people be screened or tested for covid in most settings. That change is likely to affect policies in workplaces, schools and day-care centers.

“When considering whether and where to implement screening testing of asymptomatic people with no known exposure, public health officials might consider prioritizing high-risk congregate settings, such as long-term care facilities, homeless shelters, and correctional facilities, and workplace settings that include congregate housing with limited access to medical care,” the CDC wrote in the report explaining the changes.

One CDC webpage, titled “<a href="https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html" target="_blank">How to Protect Yourself and Others</a>,” has been extensively revised. It no longer states, for example, “If possible, maintain 6 feet between the person who is sick and other household members.” The new language is more nuanced, does not employ the 6-foot rule, and acknowledges that it may be impractical to stay away from a sick person: “In those situations, use as many prevention strategies as you can, such as practicing hand hygiene, consistently and correctly wearing a high-quality mask, improving ventilation, and keeping your distance, when possible, from the person who is sick or who tested positive.”

Under the new guidance, <a href="https://www.cdc.gov/coronavirus/2019-ncov/your-health/isolation.html?CDC_AA_refVal=https%3A%2F%2Fwww.cdc.gov%2Fcoronavirus%2F2019-ncov%2Fyour-health%2Fquarantine-isolation.html" target=_blank>quarantine procedures </a>have been relaxed: Unvaccinated people who have had close contact with someone who is infected no longer are advised to go through a five-day period of quarantine if they have not tested positive for the virus or shown symptoms.

Previous CDC guidance said people who had been exposed but were up to date on their coronavirus shots could skip the quarantine period. The new guidance expands that standard to everyone.

The updated CDC guidance does not call for dropping all precautionary measures. For example, people who have been exposed — but not confirmed to be infected — should still wear a mask and get tested at least five days after exposure.

People who test positive should continue to isolate immediately and stay home for five full days if positive. (“Isolation,” as opposed to “quarantine,” covers those known to be infected or who are symptomatic.)

The CDC did not call for a negative test before exiting isolation. Some infectious-disease experts have argued that a negative test offers direct evidence of a person’s potential to spread the virus, unlike the one-size-fits-all timeline. And the five-days standard has been criticized as too short. A recent study found that people continue to test positive on antigen tests for eight days, on average, after becoming infected.

“I think the question is, is the CDC finally saying, ‘Look, we’ve done what we can do to contain the most acute phases of this pandemic?’” said Jeanne Marrazzo, an infectious-diseases expert and clinician at the University of Alabama at Birmingham. “So are they just finally saying that it is time for us to sort of take a step back and think about putting this back to the individual person?”

The more relaxed guidelines are “a concession to realism, to the way that a lot of people are handling this,” said William Hanage, an epidemiologist at the Harvard T.H. Chan School of Public Health. He called the new guidelines “entirely reasonable,” but added, “My major concern is whether they will continue to be entirely reasonable given the unpredictable dynamics of the virus.”

The revision by the CDC of its coronavirus guidance is the most significant move by the agency since the massive outbreak of infections from omicron last winter. Omicron sickened tens of millions of people in a matter of weeks. The CDC had been recommending a 10-day isolation period up to that point, but omicron quickly decimated the labor force and the agency abruptly cut isolation guidance in half.

The CDC is not a regulatory body. Its guidelines do not have the force of law. But many government jurisdictions, businesses, schools and millions of people have tried to adhere to the agency’s guidelines during the pandemic.

Social factors and not just virologic ones have shaped the CDC’s approach. The agency’s director, Rochelle Walensky, has said the agency wants to offer practical recommendations that can, and will, be followed by a broad swath of the public. That means taking equity issues into account, because people do not have equal access to tests, or the same ability to work remotely or isolate from family members. The agency has said it wants to avoid unnecessary extension of isolation for people who test positive but are unlikely to still be infectious.

Public health experts, interviewed in recent days about the anticipated loosening of restrictions, said the changes reveal the Biden administration’s strategic shift toward a “live with the virus” approach.

Although the latest omicron subvariant, BA.5, has fueled a wave of infections in many parts of the country over the past two months, the great majority of those cases have not required hospitalization.

“The pandemic is in a very different spot” than it was last year, said David M. Aronoff, an infectious-disease expert and physician at Indiana University. “We know the majority of Americans have some immunity to SARS-CoV-2, either because they’re immunized by a vaccine or immunized by an infection.”

Thursday’s CDC action arrives as the agency’s latest data indicates the summer BA.5 wave has peaked. The share of the country living in the highest level of stress on the medical system has dropped from 61 percent to 45 percent during the past two weeks. The South, where 66 percent of the people live in high-covid areas, continues to be by far the most-affected area, but all four regions of the country showed declining covid intensity the past two weeks.

Many workplaces may use the latest guidance to stop routine testing, and may cut back on other preventive policies, Aronoff said. But if there is a spike in severe illness and deaths in the fall, “there has to be a willingness to ramp up or dial up our preventive strategies if needed,” Aronoff said.

Caitlin Rivers, an infectious-disease epidemiologist at the Johns Hopkins Center for Health Security, said it made sense to standardize the quarantine guidance regardless of vaccination status.

“The vaccines remain protective against severe illness, but the combination of variants and waning [immunity] have eroded their protection against infection,” Rivers wrote in an email. But, she added, “I feel strongly that people who are exposed should wear a mask and test between Days 5 and 7 to avoid infecting others.”

Rivers said she was sorry to see the agency drop its recommendation that testing be used to screen for the virus, calling it a “useful tool for identifying outbreaks early and monitoring the burden of disease in a population.” The expense can be a barrier, she said, but “absenteeism and losses in learning or productivity are also costly.”

Julia Raifman, an assistant professor at the Boston University School of Public Health, said what is most notable about the guidelines is what is missing.

“The CDC sets the bar on what should happen, like a speed limit,” Raifman wrote in an email. “Instead, we have the CDC establishing that there are no speed limits and making it very difficult for state and local governments to set better policies.”

There is no policy guidance “to reduce a bad surge and its harms to health as well as widespread disruption of education and work by turning on a mask mandate and increased testing,” Raifman said. CDC should “establish longer-term policies for living with less COVID and have policy preparedness to make surges less harmful and disruptive to health and the economy.”

The new guidance also provides additional information about the reliability of rapid antigen tests and the importance of testing more than once — what is known as serial testing. It comes amid evidence that many people who are symptomatic with an illness and suspect they have covid are still testing negative, initially, on the at-home tests.

The new guidance says people who are exiting isolation and don’t want to wear a mask for another five days, as the CDC recommends, can take two tests to reach mask-free status. One test should come no sooner than Day 6 (after symptoms appeared, or the person had that initial positive test result). The second test should come 48 hours later, the new guidance said. Two antigen tests with more than 48 hours between them provides “more reliable information because of improved test sensitivity,” the guidance said. People should have two consecutive negative tests to discontinue masking, the guidance said.

A University of Massachusetts research study, posted online but not yet published in a peer-reviewed journal, has spurred the government to embrace serial testing. The study showed that two rapid antigen tests conducted 48 hours apart were sensitive to 93 percent of the infections detected independently by the much more accurate PCR tests during the initial week of infection. But a single rapid test caught only 60 percent of infections among symptomatic people on the day they came up positive on the more sensitive PCR test, according to the study’s lead author, Apurv Soni, director of the program in digital medicine at the University of Massachusetts Chan Medical School.

“Public health implications of our findings suggest that people who are suspected to be infected with SARS-CoV-2 should exercise caution despite an initial negative rapid antigen-test and favor mask-wearing and avoiding crowded places,” the authors wrote. Given reports of people continuing to test positive after five days of isolation, the authors said their findings “support isolation for a longer period of time to prevent the potential of spread of SARS-CoV-2 to others.”

Even so, the CDC is not making major changes in its recommendation for people who are recovering from covid and want to know when they can exit isolation. That guidance says patients can end isolation five days after their first day of symptoms, so long <a href="https://www.cdc.gov/coronavirus/2019-ncov/your-health/quarantine-isolation.html">as their </a><a href="https://www.cdc.gov/coronavirus/2019-ncov/your-health/isolation.html?CDC_AA_refVal=https%3A%2F%2Fwww.cdc.gov%2Fcoronavirus%2F2019-ncov%2Fyour-health%2Fquarantine-isolation.html" target=_blank>symptoms have improved and they have been fever-free</a> for at least 24 hours without fever-reducing medication. The CDC encourages people who become very sick or have weakened immune systems to isolate for 10 days.

In the coming days, the agency plans to consolidate hundreds of websites related to its covid response, each with different messages on testing, ventilation and masking in different settings.

Jacqueline Dupree and Dan Keating contributed to this report.

Pulitzer Prize for National Reporting for coverage of the war on terrorism, part of national reporting team, 2002

 Robert F. Kennedy journalism award, international print, 1994 

Cornell University, BS in communication

Columbia University, MA in journalism

Lena H. Sun is a national reporter for The Washington Post covering health with a special focus on public health and infectious disease. A longtime reporter at The Post, she has covered the Metro transit system, immigration, education and was a Beijing bureau chief. 

Lena H. Sun

Princeton University, politics, 1982

Joel Achenbach covers science and politics for the National desk. He has been a staff writer for The Post since 1990. 