By Nancy Lapid

(Reuters) – Here is a summary of recent studies on COVID-19. These include studies that require further research to confirm the conclusions դեռ which have yet to be validated by the peer.

Asymptomatic COVID-19 is very common

According to a review of data from more than 350 studies published in April 2021, about one-third of people with COVID-19 have no symptoms. Asymptomatic infections were more common in children than in the elderly or without existing medical conditions. Pratta Sah from Yale School of Public Health, who led the analysis published in PNAS on Tuesday at “His team estimates that 46.7% of infected children have no symptoms,” he said. “This is particularly troubling, as large, well-interacting settings between large groups of young individuals are particularly susceptible to COVID-19 high-speed events that may go undetected if the school authorities only address the symptoms.” Senior author Alison Galvani, who is also from Yale School of Public Health, said that asymptomatic people can still pass the virus on to others, which makes wearing masks during the reopening of potential schools.

Weight loss surgery is associated with better COVID-19 results

New obstetric surgery may have a protective effect against the poor results of COVID-19, according to data from a New York hospital. There, doctors studied 620 patients with COVID-19, including 130 who had previously undergone so-called bariatric surgery to treat their obesity. but did not undergo these surgeries. Patients undergoing bariatric procedures, such as gastric bypass grafting, gastric lavage, or gastrectomy, were less likely to be hospitalized, less likely to have a mechanical ventilator, and less likely to die in hospital. , although many of them were still obese. They were also discharged faster from the hospital, and those who were admitted to the intensive care unit spent fewer days there. “Patients with Ity obstruction have been disproportionately affected by COVID-19, with a higher risk of serious illness and death,” the authors note. They added that although the study could not prove that bariatric surgery had produced better results, the results showed that it could be a “protective factor against severe COVID-19 …

Sm smart may disrupt the mRNA vaccine response

Current aponomic researchers claim that current smokers may have lower immune responses to COVID-19 vaccines, or that more research is needed. In a preliminary study of 378 health workers aged 328 to 54, researchers analyzed levels of protective antibodies from mfNA vaccine from Pfizer և BioNTech using blood samples about three months after the second dose. Previous studies have shown that older participants had lower levels of antibodies. The only risk factors for lowering antibody levels with age were male smoking, The difference between the sexes may have been due to the fact that women smoked twice as much as researchers. In an article posted on medRxiv on on Saturday, they noted that the level of antibodies in former smokers was higher than in current smokers, which “suggests that quitting smoking will reduce the risk of antibodies.” title “.

Microscopic damage to the lungs can continue in “prolonged COVID”

Persistent breathing problems that plague some COVID-19 survivors, known as “prolonged COVIDs,” may be due to microscopic processes that continue to damage the lungs even after an acute infection. The researchers examined the blood and respiratory cells of 38 patients who still had respiratory problems at least three months after discharge from the hospital. Compared to healthy volunteers, the survivors of these COVID-19 survivors had higher numbers of immune cells that protect against viruses but can also cause damage. They had higher levels of protein, which is present during cell death and tissue repair. The findings, which still need to be confirmed in larger studies, suggest that some patients have persistent immune cell disorders, damage to cells in the airway wall, even a few months after the initial infection, and discharge from the hospital. Co-author of the report published on medRxiv:, before the equation. “In a small group of patients, we were able to show that the deviations could actually be resolved over time,” Harker said.

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(Report: Nancy Lapid; edited by Tiffany Wu)