Health
CDC drops its 5-day COVID isolation guidelines
It is no longer necessary to isolate for five days after testing positive for COVID-19, according to a Friday statement from the U.S. Centers for Disease Control and Prevention (CDC).
The new guidance tells people to stay home if they are sick, but when they are feeling better and have been fever-free for 24 hours, they can return to school or work.
The CDC does recommend continuing to wear a mask for five days, while washing hands, maintaining physical distance and focusing on good ventilation.
This is the same guidance given for flu and other respiratory illnesses.
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“Our goal here is to protect those at risk for severe illness while also reassuring folks that these recommendations are simple, clear, easy-to-understand and can be followed,” said Mandy Cohen, CDC director, in a statement to media on Friday.
The updated guidance “reflects the progress we’ve made in protecting against severe illness from COVID,” she added.
The CDC on Friday announced that it is no longer necessary for people to isolate for five days after testing positive for COVID-19. (Elijah Nouvelage/Bloomberg via Getty Images)
Prior to Friday’s update, the CDC called for people who test positive for the virus to “stay home for at least five days and isolate from others in your home,” a recommendation that was implemented in late 2021.
At the start of the pandemic, the agency had recommended a 10-day isolation period for people who tested positive for the virus.
‘One set of guidelines’
Dr. Marc Siegel, clinical professor of medicine at NYU Langone Medical Center and a Fox News medical contributor, spoke with Cohen on Thursday ahead of the updated guidance.
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“The change is based on the fact that, according to Dr. Cohen, though wastewater analysis for COVID is very high, at the same time, case counts and hospitalizations are MUCH lower,” he told Fox News Digital.
“The goal is to have one set of guidelines for all respiratory viruses — flu, RSV, COVID, etc.,” Siegel noted.
Prior to Friday’s update, the CDC called for people who test positive for the virus to “stay home for at least five days and isolate from others in your home,” a recommendation that was implemented in late 2021. (iStock)
Cohen did indicate that the new recommendation does not apply to every patient.
“The immunocompromised, pregnant women and chronically ill may wait longer based on the advice of their physician,” Siegel said.
“The goal is to have one set of guidelines for all respiratory viruses.”
By the time someone tests positive for COVID, they are most likely at least two days into the illness, according to Cohen, and emerging data shows that the times of greatest transmission are right before symptoms begin and in the first few days of illness.
“Being recently vaccinated and taking Paxlovid (when indicated) within the first few days will help you recover much quicker,” Cohen told Siegel.
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Some states had already relaxed their own guidelines prior to the CDC’s official update.
In both Oregon and California, people with COVID have not had to isolate at all — as long as they have been fever-free for 24 hours without using fever-reducing medicines and their other COVID symptoms are improving, according to each state’s health department.
At the start of the pandemic, the agency recommended a 10-day isolation after testing positive for the virus. (iStock)
Siegel said he is in agreement with removing the five-day isolation period.
“The pandemic has been over for several months, and though there was an uptick this winter, with over 20,000 hospitalizations and 1,500 deaths per week at one point, it is now diminishing,” the doctor said.
Some doctors believe there should be at least somewhat stricter guidelines for COVID.
One doctor said the isolation period should be one to two days longer for COVID than for flu. (iStock)
Dr. Ben TenOever, head of the Virology Institute at New York University, told Siegel that he thinks the isolation period should be one to two days longer for COVID than for influenza.
“This is because SARS COV-2 travels farther on smaller droplets than flu,” Siegel said.
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Also, flu tends to generate a lot of non-infectious material after it’s been in the body for a few days, TenOever noted, which means the flu coming out of a person’s mouth or nose when coughing or sneezing may be pieces of dead flu virus.
SARS COV-2, by contrast, stays intact because it is more compact, so it may remain infectious longer, the doctor said.
COVID numbers continue downward trend
As of the most recently reported week ending Feb. 24, the share of administered COVID tests with positive results was 7.4%, a 0.6% decrease from the prior week, per CDC data.
Of all emergency department visits, 1.8% of them resulted in a diagnosis of COVID, a 0.9% week-over-week decline.
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COVID-related hospitalizations decreased 10.3% from the prior week.
The share of all U.S. deaths due to COVID was 2.1%, which reflected an 8.7% decrease.
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Health
Forcing an early wake-up time could harm your health, sleep doctors warn
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With a new year underway, it might seem like a good idea to embrace a stricter morning routine of waking up early and getting a jump-start on the day — but a 6 a.m. alarm isn’t for everyone, experts say.
“Morning birds” fall asleep and reach deep sleep earlier, often waking up more alert, while “night owls” naturally sleep later and rely more on late-night and early-morning REM. Waking too early can leave night owls groggy and less mentally restored.
“We need to move beyond the ‘early bird gets the worm’ sayings and consider the biological cost of fighting one’s internal clock,” Dr. Aaron Pinkhasov, chair of the Department of Psychiatry at NYU Grossman Long Island School of Medicine, told Fox News Digital.
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The science of sleep
People sleep in repeated 90- to 110-minute cycles that alternate between deep NREM sleep and REM sleep, according to Pinkhasov.
Early in the night, deep sleep dominates, supporting physical repair, immunity and memory. Later cycles include more REM sleep, which supports learning, emotional regulation and brain function. Brief awakenings between cycles are normal.
Woman stopping an alarm clock (iStock)
Whether someone naturally rises early or late depends on the body’s “chronotype,” that is, whether they’re a morning bird or a night owl, he said.
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The chronotype is a “genetic blueprint” that determines when the body is naturally more alert or ready to rest, according to Pinkhasov.
“About 40% to 50% of our sleep-wake preference is inherited, meaning our internal clock is hardwired,” he noted.
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Waking earlier than one’s body’s clock often means sacrificing REM sleep. Forcing this discrepancy between the internal clock and the alarm clock can lead to “wired but tired” fatigue, mood instability and long-term metabolic risks, Pinkhasov warned.
“About 40% to 50% of our sleep-wake preference is inherited, meaning our internal clock is hardwired,” one expert said. (iStock)
“Unfortunately, because a lot of people have early work, family or social commitments, night owls have a higher prevalence of anxiety, depression, eating disorders, obesity, obstructive sleep apnea and [type 2 diabetes],” Dr. Nissa Keyashian, a California board-certified psychiatrist and author of “Practicing Stillness,” told Fox News Digital.
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Ultimately, health and productivity are highest when prioritizing consistency and sleep quality over an early-morning goal, experts say.
“The main benefit of switching to an earlier schedule is social alignment. It makes it easier to navigate a world built around a 9-to-5 lifestyle. However, the drawbacks can be significant if the shift is forced,” Pinkhasov said.
While waking at set times may improve social alignments, it can harm those who don’t naturally fit the mold. (iStock)
Smart shifts
There are some ways to “rewire” internal clocks or at least lessen the negative effects. Experts agree that having a regular bedtime and wake-up time — even on the weekends — can help.
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Pinkhasov recommends a wind-down nighttime routine that includes minimizing electronics, meditating, using essential oils, taking a warm shower or bath or drinking warm, herbal tea.
Pushing up your wake-up time by just 15 minutes a day is the most helpful, according to Keyashian.
Briefly waking up between REM cycles is normal, and adjusting to those cycles may help people wake up easier. (iStock)
The expert also recommends exposure to bright light in the morning, which can be helpful for mood, energy and concentration. People who experience dips in mood during the winter months can also benefit from using a therapeutic light box.
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“If you believe this might be you, I recommend speaking with a psychiatrist,” she advised. “I also recommend minimizing caffeine. Some people also notice difficulty falling asleep with exercise late in the day, so be mindful of this as well.”
Health
Space experiments reveal new way to fight drug-resistant superbugs, scientists say
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Research conducted partly aboard the International Space Station (ISS) suggests that “microgravity” could help scientists fight drug-resistant superbugs, according to a report from SWNS.
Microgravity is the condition in which people or objects appear to be weightless, NASA states.
Experiments by researchers at the University of Wisconsin-Madison show that viruses and bacteria behave differently in near-weightless conditions. In space, they develop genetic changes not typically seen on Earth.
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Lead study author Dr. Phil Huss, a researcher at the University of Wisconsin–Madison, noted that interactions between viruses that infect bacteria — known as phages — and their hosts play an “integral” role in how microbial ecosystems function, per the SWSN report.
Viruses that infect bacteria were still able to infect E. coli in space. However, the way those infections unfolded was different from what is typically observed on Earth.
E. coli is a group of bacteria that can live in the gut and are harmless most of the time, according to Cleveland Clinic. (iStock)
Bacteria and phages are often described as being locked in an evolutionary arms race, Huss said, with each side constantly adapting to outmaneuver the other.
“Microgravity is not just a slower or noisier version of Earth — it is a distinct physical and evolutionary environment,” researcher Srivatsan Raman, Ph.D., professor of biochemistry at the university, told Fox News Digital.
“Even in a very simple phage-bacteria system, microgravity altered infection dynamics and pushed both organisms down different evolutionary paths,” he added.
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While these interactions between bacteria and phages have been well-studied on Earth, few studies have examined them in space, where they can lead to different outcomes.
For the study, Huss and his colleagues compared two sets of E. coli samples infected with a phage known as T7. One set was incubated on Earth, while the other was grown aboard the ISS.
The ISS is a microgravity environment — where people and objects appear weightless. (NASA / SWNS)
The team found that after an initial slowdown, the T7 phage successfully infected E. coli in space. Genetic analysis later revealed clear differences in how both the bacteria and the virus mutated in space compared with how they behaved on Earth, per the report.
Huss said the phages grown aboard the space station developed mutations that could improve their ability to infect bacteria or attach to bacterial cells. At the same time, the E. coli grown in space developed mutations that could help them resist infection and survive better in near-weightless conditions.
GROWING ANTIBIOTIC CRISIS COULD TURN BACTERIAL INFECTIONS DEADLY, EXPERTS WARN
Raman said some of the findings were unexpected. In particular, he noted, microgravity led to mutations in parts of the phage genome that are not well-understood and are rarely seen in Earth-based experiments.
The E. coli grown in space developed mutations that could help them resist infection and survive better in near-weightless conditions. (iStock)
Researchers then used a technique called deep mutational scanning — a method that tracks how genetic changes affect function — to examine changes in the T7 receptor-binding protein, which plays a key role in infection.
Additional experiments on Earth linked those changes to increased effectiveness against E. coli strains that are normally resistant to T7.
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“Equally surprising was that phages shaped by microgravity could be more effective against terrestrial bacterial pathogens when brought back to Earth,” Raman told Fox News Digital.
“That result suggests microgravity can reveal combinations of mutations that are difficult to access through standard laboratory evolution, but [are] still highly relevant for real-world applications.”
“Microgravity is not just a slower or noisier version of Earth — it is a distinct physical and evolutionary environment.”
Huss said the findings could help address antibiotic-resistant infections, including urinary tract infections, which have been increasing in recent years.
“By studying those space-driven adaptations, we identified new biological insights that allowed us to engineer phages with far superior activity against drug-resistant pathogens back on Earth,” Huss told SWNS.
Study limitations
“Experiments on the ISS are constrained by small sample sizes, fixed hardware and scheduling constraints,” Raman noted. “Samples also experience freezing and long storage times, which can complicate interpretation.”
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He added that the research has broader implications.
“Studying microbes in space isn’t just about space biology,” Raman said. “These experiments can uncover new aspects of viral infection and microbial evolution that feed directly back into terrestrial problems, including antimicrobial resistance and phage therapy.”
Space should be treated as a discovery environment rather than a routine testing platform, one researcher said. (iStock)
He added that space should be treated as a discovery environment rather than a routine testing platform. The most effective approach, according to Raman, is to identify useful patterns and mutations in space and then study them carefully in Earth-based systems.
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Scientists also noted that the findings highlight how microbial ecosystems, like those associated with humans, could change during long space missions.
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“Understanding and anticipating those changes will be essential as space travel becomes longer, more routine and more biologically complex,” Raman said.
The findings were published in the journal PLOS Biology.
Health
Blood test flags digestive disease risk years before symptoms appear
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A simple blood test may detect Crohn’s disease years before symptoms appear, according to a new study reported by SWNS.
Canadian researchers say the discovery could enable earlier diagnosis and potential prevention of the chronic inflammatory bowel disease (IBD).
The test measures the immune system’s response to flagellin, a protein found in gut bacteria. Researchers found that this response is elevated in some people years before Crohn’s develops.
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The findings, published in Clinical Gastroenterology and Hepatology, highlight the “interplay” between gut bacteria and immune system responses as a key step in the disease’s development, per the SWNS report.
Crohn’s disease is a chronic inflammatory condition of the gastrointestinal tract that causes persistent digestive symptoms, pain and fatigue, significantly affecting quality of life. Its incidence among children has doubled since 1995, according to official figures.
Crohn’s disease is a type of inflammatory bowel disease (IBD) that causes swelling and irritation of the tissues, called inflammation, in the digestive tract. (iStock)
The presence of flagellin antibodies long before symptoms appear suggests that the immune reaction may help trigger the disease, according to research leader Dr. Ken Croitoru, clinician-scientist and professor of medicine and immunology at the University of Toronto.
A better understanding of this early process could lead to improved prediction, prevention and treatment, the expert said.
“We haven’t cured anybody yet, and we need to do better.”
“With all the advanced biologic therapy we have today, patients’ responses are partial at best,” Croitoru told SWNS. “We haven’t cured anybody yet, and we need to do better.”
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“We wanted to know: Do people who are at risk, who are healthy now, have these antibodies against flagellin?” he said. “We looked, we measured, and yes indeed, at least some of them did.”
This new research is part of the Genetic, Environmental and Microbial (GEM) Project, which has followed more than 5,000 healthy first-degree relatives of people with Crohn’s disease worldwide since 2008. The project collects genetic, biological and environmental data to better understand how the disease develops.
The presence of flagellin antibodies long before symptoms appear suggests that the immune reaction may help trigger the disease, according to the lead researcher. (iStock)
The study followed 381 first-degree relatives of Crohn’s patients, 77 of whom later developed the disease. Of those, more than 30% had elevated antibody responses.
The responses were strongest in siblings, underscoring the role of shared environmental exposure, researchers said.
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So far, 130 of the study participants have developed Crohn’s, giving researchers a rare opportunity to study its earliest stages. The average time from blood sample collection to diagnosis was nearly 2-½ years.
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Previous GEM research showed that an inflammatory immune response targeting gut bacteria can appear long before the disease develops.
The study followed 381 first-degree relatives of Crohn’s patients, 77 of whom later developed the disease. (iStock)
In healthy people, gut bacteria coexist peacefully and play an essential role in digestive health — but in Crohn’s patients, the immune system appears to mount an abnormal response against the microbes, experts say.
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The Canadian team also confirmed that this pre-disease immune response was associated with intestinal inflammation and gut barrier dysfunction, both hallmarks of Crohn’s disease.
The study did have some limitations, including that it did not include experiments to show exactly how the immune response might lead to Crohn’s disease. (iStock)
Research team member Dr. Sun-Ho Lee, a gastroenterologist, commented that this new study supports the idea of designing a flagellin-directed vaccine for certain high-risk individuals to prevent the disease, according to SWNS.
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The study did have some limitations, including that it did not include experiments to show exactly how the immune response might lead to Crohn’s disease.
As a result, the researchers could not determine the biological steps linking the immune reaction to the onset of the illness. “Further validation and mechanistic studies are underway,” they noted.
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