Publisher Health

Normal household waste is collected and disposed of by waste collectors, and a similar process occurs in cells to remove damaged and potentially harmful proteins. A new research study in Science Advances provides a better understanding of how this is done.
The cells use proteases for housekeeping in almost the same way as waste collectors dispose of household waste.
“Think about what happens when waste collectors go on strike in a big city. Similarly, a non-functioning waste collection system in a cell can lead to chaos when damaged proteins accumulate. This could allow serious diseases to develop,” says Björn M. Burmann, senior lecturer and researcher in chemistry at the University of Gothenburg, and team leader for the researchers behind the new study.
Neutralises harmful proteins
The researchers used the single-cell bacterium Escherichia coli as a model system to gain a better understanding of how proteases keep cells clean. This is a bacterium that is found in the human intestine that has adapted to survive under a range of stressful environmental conditions.
“One of the waste collection disposal workers in the bacterial cell is the enzyme DegP, a protease that can eliminate unstable and harmful proteins by shredding them into pieces and thus prevent them from building up in the cell,” says Darius Šulskis, principal author of the study and doctoral student in Björn M. Burmann’s research group.
Temperature switches activate response
Until now it was unknown what activated DegP, but Darius Šulskis has shown in the study that DegP is activated by a temperature switch is controlled at a molecular level. DegP is inactive at low temperatures but activates at high temperatures. This starts up the waste disposal work in the cell, disposing of hazardous rubbish.
“Understanding this built-in cleaning mechanism means that it can be used in medical research and be important for future medical applications,” says Björn M. Burmann.
Facts
Proteases are enzymes, biological catalysts, that facilitate proteolysis, decomposition of proteins into smaller parts, such as peptides or even individual amino acids. The research was conducted using Nuclear magnetic Resonance in the advanced NMR spectroscopy infrastructure at the Swedish NMR Centre, which is hosted by the University of Gothenburg. The study is the work of researchers from the University of Gothenburg and the Wallenberg Centre of Molecular and Translational Medicine. The research was made possible by funding from the Knut and Alice Wallenberg Foundation (BMB), the Swedish Research Council (BMB) and an EMBO Long-term Fellowship to co-author Johannes Thomas.
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Materials provided by University of Gothenburg. Note: Content may be edited for style and length.

According to an article in ARRS’ American Journal of Roentgenology (AJR), MRI — with or without FDG PET coregistration — can improve the staging of patients with small cell lung cancer (SCLC).
“FDG PET/CT, whole-body MRI, and coregistered FDG PET/MRI outperformed conventional tests for various staging endpoints in patients with SCLC,” concluded first author Yoshiharu Ohno from the Fujita Health University School of Medicine in Japan. Whole-body MRI and FDG PET/MRI outperformed FDG PET/CT for T category and thus TNM stage, “indicating utility of MRI for assessing extent of local invasion in SCLC.”
Ohno and colleagues’ prospective study included 98 patients (64 men, 34 women; median age, 74 years) with SCLC who underwent conventional staging tests (brain MRI; neck, chest, and abdominopelvic CT; bone scintigraphy), FDG PET/CT, and FDG PET/MRI within 2 weeks before treatment. After MRI technologists performed coregistration via proprietary software (Canon Medical Systems), two nuclear medicine physicians and two chest radiologists independently reviewed the examinations in separate sessions.
In patients with SCLC, accuracy for T category was higher (p

Avoiding excess weight, especially obesity, should be a priority for thyroid cancer prevention, the first study to evaluate future thyroid cancer burden in Australia has found.
The world-first study published in the International Journal of Cancer and led by Dr Maarit Laaksonen from UNSW’s School of Mathematics and Statistics, found that one in five future thyroid cancers in Australia is attributable to current levels of overweight and obesity.
Dr Laaksonen, a senior lecturer in Data Science, says this is concerning as the prevalence of obesity in Australia has doubled during the last two decades, with 75 per cent of Australian men and 60 per cent of Australian women being overweight or obese.
“This finding translates to close to 10,000 thyroid cancers in the next 10 years,” Dr Laaksonen says. “Obesity explains 75 per cent of this burden in Australia.”
The main authority for cancer research, the International Agency for Research on Cancer, has concluded that body fatness is a causal risk factor of thyroid cancer.
But Dr Laaksonen says this is the first time a study has evaluated the thyroid cancer burden attributable to current levels of overweight and obesity and compared this burden by sex.

Women who gave birth to a premature baby after developing pre-eclampsia were 17 times more likely to experience another preterm birth if pre-eclampsia emerged again, new Curtin University research has found.
The study, published in the British Journal of Obstetrics and Gynaecology, examined more than 125,000 women who experienced two consecutive singleton births in Western Australia from 1998 to 2015.
About 27,000 babies are born prematurely — or before 37 weeks’ gestation — across Australia each year, with preterm birth the leading cause of death and morbidity in children up to five years of age in the developed world.
Lead author and PhD candidate Jennifer Dunne, from Curtin’s School of Population Health, said the findings showed the strongest link between preterm birth and pregnancies complicated by pre-eclampsia, a serious pregnancy condition that is usually characterised by high blood pressure, protein in the urine and severe swelling.
“When both pregnancies were complicated by pre-eclampsia, the risk of a subsequent preterm birth increased 10-fold after an initial term birth and 17-fold when the first birth was preterm, compared to women who had an uncomplicated first pregnancy,” Ms Dunne said.
“This study also found that there was a three-fold higher risk of women experiencing a subsequent case of pre-eclampsia after a preterm birth in the first pregnancy that was not complicated by pre-eclampsia.
“Until recently, a first birth at full term was considered a reduced risk for a preterm delivery in the next pregnancy. However, there is emerging evidence that a complicated first pregnancy, regardless of whether the baby was delivered early or at full term, increases the subsequent risk of a baby being born prematurely.”
Ms Dunne said the main pregnancy complications examined included pre-eclampsia, placental abruption (the detachment from the wall of the womb), small-for-gestational age and perinatal death (a stillbirth or a neonatal death in the first 28 days).
“Having any of the four complications in their first pregnancy puts women at an increased risk of a preterm birth in their next pregnancy, regardless of whether that first birth ended at full term or preterm,” Ms Dunne said.
“Likewise, women whose first pregnancy ended in a preterm delivery were at an increased risk for each pregnancy complication in the second pregnancy.
“The findings of this study will help clinicians to better identify women who are at an increased risk of a either a preterm birth or complications in their subsequent pregnancies. Further research is now needed to reveal the specific pathways that explain these strong links between pregnancy complications and preterm births, whether they be genetic, pathological, and behavioural or other recurrent issues.”
The research was supervised by Professor Gavin Pereira and co-authored by Dr Gizachew Tessema, also from Curtin’s School of Population Health.
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Materials provided by Curtin University. Original written by Yasmine Phillips. Note: Content may be edited for style and length.

A new study has shown that the signs of age related macular degeneration can set in earlier than previously thought — even before patients begin to lose their sight. The findings open the door for research into earlier treatment that could help slow down the onset of the condition the most common cause of sight loss in the western world.
A research team led by the University of Southampton with colleagues at King’s College London and Moorfields Eye Hospital looked at the records of over 30,000 patients who had retinal scans and genetic data stored in the UK Biobank. There are 34 known genetic risk factors for age related macular degeneration (AMD) and the scientists were able to compare the retinal measurements of those with the risk factors to those without.
The findings, published in the journal Scientific Reports, showed that the participants with healthy eyes and no history of AMD had thinner retinas if they carried the genes that put them at risk.
Andrew Lotery, Professor of Ophthalmology at the University of Southampton, who led the study, along with Prof Pirro Hysi at King’s College London and Mr Praveen Patel at Moorfields Eye Hospital, said, “At the moment most treatments for AMD only start when patients already have severe problems with their eyesight so it is really important that we understand more about what causes it. These results help us understand the very early stages of the disease, before it is clinically apparent. If we can intervene at an earlier stage, we are more likely to be able to preserve sight.”
Previous research has not fully explained which cells in the eye are affected by AMD first. Further examination of the retinal scans in biobank showed that the photoreceptors, which sense light in the eyes, were also thinner for patients with the genetic risk factors. The research team advise this gives them further understanding of the early stages and will help identify which cells should be targeted in further research.
Whilst further trials will still be needed to identify treatment, being able to identify the signs of AMD earlier would allow individuals to make lifestyle changes that can put them at a higher risk of losing their vision earlier.
“Changing to a Mediterranean style diet, exercising more and stopping smoking can help prevent he progression of the disease,” Professor Lotery added. “These findings can also help us refine participants in future clinical trials so we can include patients who are most at risk,” he added.
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Materials provided by University of Southampton. Note: Content may be edited for style and length.

Environmental exposure to low-levels of the toxic metals arsenic, cadmium and titanium appears to increase the risk of plaque buildup in arteries in the neck, heart and legs, according to new research published today in the American Heart Association’s journal Arteriosclerosis, Thrombosis and Vascular Biology (ATVB).
Traces of metal may enter the body through contaminated soil that infiltrates food, through drinking water, air pollutants or tobacco smoke. There is strong evidence that toxic metals, such as arsenic and cadmium, are cardiovascular risk factors. Arsenic and cadmium are often found in tobacco and food, while arsenic is also found in water. Titanium exposure is mainly derived from dental and orthopedic implants, screws, pacemaker encasings, cosmetic products and some foods.
“Metals are ubiquitous in the environment, and people are chronically exposed to low levels of metal,” said lead investigator of the study Maria Grau-Perez, M.Sc., of the Institute for Biomedical Research Hospital Clinic de Valencia INCLIVA in Valencia, Spain, and a Ph.D. candidate in the department of preventive medicine, public health and microbiology at the Universidad Autonoma de Madrid, in Spain. “According to the World Health Organization, 31% of the cardiovascular disease burden in the world could be avoided if we could eliminate environmental pollutants.”
Atherosclerosis develops when fatty deposits, or plaque, builds up in the arteries causing them to narrow, weaken and stiffen. Depending on the arteries affected, it can lead to a heart attack, stroke, angina, peripheral artery disease or kidney disease.
Prior research on the impact of metal exposure on atherosclerosis has traditionally centered on the carotid arteries, the major arteries in the neck. This study focused on subclinical atherosclerosis — before symptoms are present — and examined the impact of metal exposure on the carotid, femoral and coronary arteries. Previous research suggests that imaging of the femoral artery, which is the main artery supplying blood to the lower body, may lead to earlier detection of atherosclerosis.
Researchers evaluated 1,873 adults (97% men) in the Aragon Workers Health Study. The study participants worked at an auto assembly factory in Spain and ranged in age from 40 to 55. Researchers measured participants’ environmental exposure to nine toxic metals — arsenic, barium, uranium, cadmium, chromium, antimony, titanium, vanadium and tungsten — and the exposure’s association with the presence of subclinical atherosclerosis in the carotid, femoral and coronary artery regions. The study explored the potential role of individual metals and metal mixtures on the development of atherosclerosis.
During the participants’ annual occupational health visits between 2011 and 2014, socioeconomic and health information for each participant were recorded, including education level, smoking status and medication use. Each person in the study had a medical examination to measure body mass index, blood pressure, blood glucose levels, cholesterol levels, triglyceride levels and more. Urine samples were collected to assess metal exposure from air, water and food. Researchers performed carotid and femoral ultrasounds, as well as coronary calcium scoring tests.
The analysis found: Older study participants had higher levels of most of the metals measured in the urine The few female participants in the study had higher metal levels compared to men, when levels were measured in the urine. Adults who had smoked at any time showed higher levels of arsenic, cadmium, chromium and titanium than the people who had never smoked. Higher levels of arsenic, cadmium, titanium, and potentially antimony were associated with a higher probability of having subclinical atherosclerosis. Arsenic and cadmium appear to be most closely associated with increased plaque levels in the carotid arteries; cadmium and titanium are of greater concern for the femoral arteries; and titanium, and possibly cadmium and antimony, are of more concern for the coronary arteries. Arsenic may be more toxic for the arteries when found in combination with cadmium and titanium.”This study supports that exposure to toxic metals in the environment, even at low-levels of exposure, is toxic for cardiovascular health,” said study co-author Maria Tellez-Plaza, M.D., Ph.D., a senior scientist at the National Center for Epidemiology and the Instituto de Salud Carlos III in Madrid, Spain. “The levels of metals in our study population were generally lower compared to other published studies. Metals, and in particular arsenic, cadmium, and titanium, likely are relevant risk factors for atherosclerosis, even at the lowest exposure levels and among middle-aged working individuals.”
The study included a very specific population of mostly men in one area of Spain, so the results may not be completely extrapolated to women or other populations world-wide. Additional research is needed to understand the mechanisms involved in the development of atherosclerosis based on associations to metals.
“Current global environmental, occupational and food safety standards for cadmium, arsenic and other metals may be insufficient to protect the population from metal-related adverse health effects,” said Tellez-Plaza. “Metal exposure prevention and mitigation has the potential to substantially improve the way we prevent and treat cardiovascular disease.”

Scientists have discovered that gene therapy and the diabetes drug metformin may be potential treatments for late-onset retinal degeneration (L-ORD), a rare, blinding eye disease. Researchers from the National Eye Institute (NEI), part of the National Institutes of Health generated a “disease-in-a-dish” model to study the disease. The findings are published in Communications Biology.
“This new model of a rare eye disease is a terrific example of translational research, where collaboration among clinical and laboratory researchers advances knowledge not by small steps, but by leaps and bounds,” said Michael F. Chiang, M.D., director of the NEI, part of the National Institutes of Health.
L-ORD is a rare, dominantly inherited disorder, meaning that it can occur when there is an abnormal gene from one parent. L-ORD is caused by a mutation in the gene that encodes the protein CTRP5. People with the disorder develop abnormal blood vessel growth and deposits of apolipoprotein E, which is involved in fat metabolism within the retina. Symptoms, including difficulty seeing in the dark and loss of central vision, usually appear around age 50 to 60. As L-ORD progresses, cells in the retinal pigment epithelium (RPE), a layer of tissue that nourishes the retina’s light-sensing photoreceptors, shrink and die. Loss of RPE leads to the loss of photoreceptors and in turn, to loss of vision.
The investigators were led by Kapil Bharti, Ph.D., who directs the NEI Ocular and Stem Cell Translational Research Section, and Kiyoharu (Josh) Miyagishima, Ph.D. and Ruchi Sharma, Ph.D., staff scientists in the section and leading authors of the study. They developed a laboratory model that uses induced pluripotent stem cells developed from skin (fibroblasts) to make RPE. They generated RPE from two siblings with L-ORD and, for comparison, RPE from two of the patients’ unaffected siblings who lacked the disease-causing mutation.
The patient-derived RPE shared key characteristics of the disorder in humans, including deposits of apolipoprotein E near the tissue, and abnormal secretions of vascular endothelial growth factor, a protein that stimulates blood vessel growth. The RPE cells also were dysmorphic, or deformed. By contrast, RPE from the unaffected siblings appeared normal. The researchers also found that the patient-derived RPE secreted far less of the mutant and the non-mutant CTRP5 protein compared with the models made from the unaffected siblings.
Using a computer modeling technique, they showed that mutant CTRP5 was less likely to bind with cell receptors that help fine-tune fat metabolic regulation. Less receptor binding in turn leads to chronic activation of AMP-activated protein kinase (AMPK), a key regulator of energy homeostasis and fat metabolism.
They theorized that when AMPK is chronically activated, it becomes less sensitive to imbalances in energy demand and nutrient supply. When metabolic imbalances run unchecked, they alter lipid metabolism, which explains how apolipoprotein E accumulates as deposits near the RPE layer.
Testing that theory, the researchers chemically inhibited the chronically activated AMPK in the patient-derived RPE model and found fewer deposits of apolipoprotein E, and less abnormal secretion of vascular endothelial growth factor.
Next, using the patient-derived RPE model, they tested two potential treatment strategies: A gene therapy approach to encourage expression of normal CTRP5 in the RPE model, and the use of the diabetes drug metformin, which appears to modulate AMPK activity, re-sensitizing it to changes in cellular energy status. Both strategies prevented signs of L-ORD in RPE models.
“Importantly, we now have two potential strategies to disrupt the L-ORD disease process. While gene therapy may be years away, metformin is a drug that’s long been used to treat diabetes,” said Bharti, who with NEI collaborators is planning a clinical trial to test the drug in people with L-ORD.
Although L-ORD disease is rare, it shares similarities with other retinal degenerations like age-related macular degeneration, a leading cause of vision loss. The model developed for this study may prove helpful in understanding such age-related disease changes in the RPE.
The study was funded by the NEI Intramural Research Program grants EY005121 and EY026525.

When the body attempts to fight off an infection, immune cells called neutrophils may shoot out spider web-like networks of toxic proteins to help contain the invaders. However, when not properly regulated, these web-like neutrophil extracellular traps, or NETs, play a role in forming blood clots and promoting inflammation for several diseases, including COVID-19.
Utilizing the uncommon drug defibrotide, researchers recently found success at stopping the formation and progression of the noxious NETs. Defibrotide is a complex mixture of short DNA fragments — purified from the cells of pig intestines. It’s currently used to treat blockages in the liver’s blood vessels after stem cell transplantation.
NETs are major contributors to blood clotting in patients with an autoimmune disease known as antiphospholipid syndrome, also commonly referred to as APS. Defibrotide was first reported as a possible treatment for a life-threatening form of APS some 20 years ago, but the mechanism was unknown.
Inspired by this observation, a team of rheumatologists at Michigan Medicine recently tested how defibrotide interacted with immune cells. They found not only that the treatment suppressed neutrophils from releasing NETs, but it also reduced downstream blood-clotting in mice with APS, according to results published in Arthritis & Rheumatology.
The treatment was so effective at neutralizing NETs and thrombosis that it made mice with APS look and behave like completely healthy mice, said Jason Knight, M.D., Ph.D., senior author of the paper and associate professor of rheumatology at Michigan Medicine.
“This could be significant for the severest forms of APS, the cases that land people in the hospital where they require emergency treatment,” Knight said. “Progress was stalled on proper clinical trials given little understanding of the mechanisms by which defibrotide helped APS. We hope this work will contribute to changing that.”
The first and only case of defibrotide and APS was written 20 years ago by Doruk Erkan, M.D. M.P.H., a co-author of the paper and rheumatologist at the Hospital for Special Surgery in New York City.

A bipartisan group led by two former governors is urging President Biden to help an estimated 167,000 children who have lost parents or caregivers.WASHINGTON — Courtney Grund, whose husband died of Covid-19 in August, got an alarming text message last week: Her 16-year-old son was “talking about self-harm,” according to the message, sent by his friend. She quickly signed him up for grief counseling, she said in a tearful interview, using her maiden name to protect his privacy.John Jackson, a disabled veteran on a fixed income, said he had struggled to find help for his 14-year-old daughter, whose mother died in the pandemic. “I can see it in her, where she’s suffering,” he said.Pamela Addison, a reading teacher whose husband died, said she felt fortunate that she could afford therapy — $200 a session out of pocket — for her grieving 3-year-old.Although Congress has allocated trillions of dollars to combat the pandemic, including more than $100 million for existing children’s mental health programs and $122 billion for schools, the Biden administration and lawmakers have not yet created initiatives specifically for the tens of thousands of children who have lost parents and primary caregivers to Covid-19.Behind the scenes, leaders of a bipartisan coalition of experts in education, the economy and health — backed by wealthy philanthropies and headed by two former governors, Dirk Kempthorne of Idaho, a Republican, and Deval Patrick of Massachusetts, a Democrat — have been meeting with White House officials, urging them to do more.On Thursday — just two days after the surgeon general warned that young people were facing “devastating” mental health issues related to the pandemic — that group, the Covid Collaborative, will release a report estimating that more than 167,000 children in the United States have lost parents or in-home caregivers to the disease.The collaborative is asking President Biden to initiate a national campaign to identify these children and, with help from the private sector, take steps to improve their emotional and economic well-being. Its recommendations include offering them mental health care and creating a “Covid Bereaved Children’s Fund,” similar to a fund established after the Sept. 11 attacks, to provide up to $10,000 to families in need.“The president is uniquely positioned to put an official imprimatur on the call in this report to coordinate all resources, public and private, at every level of government and every level of the private sector and philanthropy to help these children,” Mr. Patrick said in an interview.“It’s a tragedy not of their making,” he added, “but they’re our kids. They belong to us, and all we are saying is, ‘Let’s act like it.’”The report, titled “Hidden Pain,” estimates that more than 70 percent of the bereaved children are 13 or younger. It is based on federal data and a modeling study led by Dan Treglia, a social policy researcher at the University of Pennsylvania.Communities of color are disproportionately affected. Dr. Treglia, who is also part of the collaborative, said racial and ethnic disparities in caregiver loss from Covid-19 exceeded the already stark disparities in coronavirus deaths.Parents and young people left behind said the push by the Covid Collaborative was welcome news, if only to force officials in Washington to recognize this new cohort of bereaved children.Ms. Grund picked up her son from school last week after she got the text from his friend; he has not yet returned.He went to his first group therapy session Tuesday evening. In an interview, he said he was having mood swings and suicidal thoughts, and had not wanted to leave his room. He would like to see initiatives that better equip teachers and school officials to help grieving students.Ms. Grund with her son and Georgie, their therapy dog. Her son said he would like to see initiatives that better equip teachers and school officials to help grieving students.Adriana Zehbrauskas for The New York Times“No one knew how to deal with what I was going through, so it was hard for the teachers to communicate to me,” he said, adding that while he could talk to his friends, it had not helped much. “I can share with them, but it’s in one ear and out the other,” he said. “They don’t completely understand and, like, process the whole situation.”A spokeswoman for the Department of Health and Human Services, Kirsten Allen, said the administration “has made a number of investments and launched several initiatives covering a wide range of mental health priorities — including support for children who have lost parents.”She cited the surgeon general’s advisory and the expansion of several existing programs. In May, for example, the department announced it was releasing $14.2 million, allocated by Congress through the American Rescue Plan, to expand access to pediatric mental health care. The rescue plan also provided money for suicide prevention programs and a program to improve care and access to services for “traumatized children.”John Bridgeland, the collaborative’s founder and chief executive officer, said expanding existing programs was not enough. “We need a focused effort to help the unbearable loss of these 167,000 children,” he said.Losing a parent or a caregiver is hard for a child in ordinary times. But experts in grief counseling and school officials say the pandemic has exacted a particular toll.“The death of a parent is something that we deal with all the time — not just with Covid,” said Susan Gezon Morgan, a school nurse in Emmett, Idaho, a small city outside Boise. “But I think the fact that Covid is in the news and so sudden, and oftentimes it’s a young parent, that it seems so much more traumatizing.”In a small community like Emmett, where everyone knows everyone else, Ms. Morgan said, the grief cuts both ways. Grieving children lose their privacy, but they also have a tight-knit community to provide support. In big cities, it is another story.Mr. Jackson, of Reisterstown, Md., just outside Baltimore, is home-schooling his daughter, Akeerah, in part because he fears her peers will be insensitive, encouraging her to “just get over” her loss.When Akeerah’s mother, Cathy Fulcher, died, Mr. Jackson got a note from the Baltimore County school system saying she could delay turning in her grades, but little in the way of guidance. Soon afterward, he said, he started looking for a place for his daughter to get therapy.“One was $250; they didn’t take any type of insurance,” he said. “That was just for us to come in for an evaluation. That’s just not in the budget.”Akeerah Jackson, 14, with her father, John, and a photo of herself with her mother, Cathy Fulcher, who died of Covid-19. A grief support center in Baltimore has helped Akeerah cope with her loss.Alyssa Schukar for The New York TimesEventually he found Roberta’s House, a grief support center for Baltimore families. There, Akeerah said, she has learned how to cope with her grief by drawing and writing in a journal, and she is now a “peer ambassador,” leading sessions for other teens. She has also attended Camp Erin, a free camp for grieving children offered in cities across the country.Both are funded by the New York Life Foundation, which also backs the Covid Collaborative and has created a website, grievingstudents.org, to provide information for educators as part of its “grief-sensitive schools” initiative, which predates the pandemic. The vice president of the foundation, Maria Collins, says many of its programs have waiting lists.“It’s known in this field that the young person is the forgotten griever,” she said, adding that the foundation was open to working with the federal government and would be “eager to provide tangible support, financial and otherwise, for Covid-bereaved children.”The collaborative envisions $2 billion to $3 billion for the bereavement fund, possibly supplemented by money from private foundations. It would help parents struggling with everything from rent payments to their children’s academic performance to finding the right therapy at a reasonable cost.The report builds on similar research: The journal Pediatrics, relying on data through June 30, before the wave of infections caused by the Delta variant, reported in October that more than 120,000 American children had lost parents or caregivers from Covid-19.The researchers who conducted the collaborative’s study found that Black and Hispanic children were roughly two and a half times as likely as whites to be bereaved as a result of the pandemic, while Native American children were nearly four times as likely. Dr. Treglia, whose research focuses on vulnerable populations, said the number of bereaved children grew quickly during the Delta surge in part because it hit so many adults of childbearing age.“There is an extraordinary responsibility to care for those children,” he said. “So many of them were facing economic and other hardships even before the pandemic began, and certainly before they lost a caregiver. Now they are facing their darkest days.”Some parents whose spouses were frontline workers say they would like at least some recognition from Washington that their loved ones died while trying to protect others.Ms. Addison, whose husband was a hospital speech pathologist in Paterson, N.J., runs a support group called Young Widows and Widowers of Covid-19. She estimates that 95 percent of her 900 members have children.“You invite athletes to the White House because they’ve won a championship; why not invite families who lost their loved one because they went into a hospital, they went into a school that wasn’t really safe?” she said. “You see when a military person dies there is this big celebration of their life and the kids know their parent is a hero. Our kids need that.”