The study, which has not yet been peer-reviewed, will challenge the widespread public opinion that Omicron – although more transmissible – leads to less severe symptoms and fewer hospitalizations.
The researchers estimated the records of 130,000 Covid patients over the past two years, covering periods when different options dominated the world.
“We found that the risks of hospitalization and mortality were almost the same between periods,” said four scientists, three of whom work at Harvard Medical School in Massachusetts.
A study called “Option Sars-Cov-2 Omicron is as deadly as previous waves after adjusting for vaccinations, demographics and comorbidities,” was published on Research area on May 2.
The findings come at a time when the new Omicron sub-variant, BA.2.12.1, seems to be spreading faster than BA.2, which is sometimes referred to as the “stealth Omicron” variant. BA.2.12.1 was responsible for about 29 percent of new coronavirus infections in the United States as of mid-April.
Doctors tested the assumption that Omicron causes less severe symptoms and disease by linking vaccination data at the state level with electronic medical records with quality control from a large health care system, including 13 hospitals in Massachusetts.
The researchers then conducted a “weighted case-control study to compare the risks of hospitalization and mortality through the Sars-Cov-2 wave in more than 130,000 Covid patients.”
Although unadjusted hospital admission and mortality rates were higher in previous waves compared to the Omicron period, after adjusting for various demographic factors, the Charleson Concomitant Disease Index and vaccination status, we found that the risks of hospitalization and mortality were near. , – researchers write.
Scientists say that to understand the “internal burden” of Omicron is difficult, because since the beginning of the pandemic has changed a number of factors that affect its action.
“Confusing factors include the launch of new vaccines and therapies, the implementation of different public health strategies, variations in vulnerabilities that can be verified by demographic factors, and differences in the use of health services,” the statement said.
The report says that any comparison between Covid-19 variants without proper adjustment of these factors “could mislead both the public and medical experts as to the true dangers of the variant.”
The researchers, however, acknowledged that their study may have several limitations, including the possibility of underestimating the number of vaccinated patients in recent Covid waves and the total number of infections because patients who performed rapid tests at home were not included.
First discovered in South Africa and Hong Kong in November 2021, by December it was confirmed that Omicron is the dominant option in the UK.
The most common symptoms are Omicron
According to an article published in the Journal of Infectious Diseases and Epidemiology Eurovisionthere is up to eight symptoms in fully vaccinated individuals suggesting that they may be infected with the Omicron coronavirus variant.
These were cough, runny nose, fatigue, sore throat, headache, muscle aches, fever and sneezing.
To this list of symptoms in vaccinated people who have contracted the Omicron variant, experts also add nausea.
Two early signs include fatigue and dizziness / fainting.
More than just a feeling of fatigue, fatigue can turn into bodily pain, causing pain or weak muscles, headaches and even blurred vision and loss of appetite.
The new variant, BA.2.12.1, also exhibits flu-like symptoms that affect the upper respiratory tract but not the lungs, said Elizabeth Mukaetov-Ladinska, a professor of senior psychiatry at the University of Leicester. Medical news today.
The incidence in the U.S. now is about 56,000 new infections a day, about half as small in April. And although the virus has also shown an increased ability to replicate and transmit from person to person, doctors aren’t sure exactly why the number of cases is increasing.
“Is it because of BA.2.12.1? Is it because people don’t wear masks? Is it because immunity from previous vaccines is weakening? These are just some of the unknowns that arise with any new option, ”said Dr. David Cutler, a family physician at Providence Saint John’s Health Center in Santa Monica.