Memory of some immune systems lasts for up to a year after infection.COVID from Omicron is also less serious for pregnant women
March 25 (Reuters)-The following is a summary of some recent studies on COVID-19. They require further research to support the findings and include studies that have not yet been certified by peer review.
Immune system memory lasts 1 year after COVID-19
One year after being infected with the coronavirus, if few antibodies in the blood are detected, the immune system should continue to “remember” the virus and react to some extent when it re-encounters, Chinese studies suggest. doing.
Researchers surveyed 141 people who were infected with the virus in early 2020 and provided blood samples 12 months later. None of them were vaccinated in the meantime.According to a report released Wednesday, most people still had low levels of antibodies, and most people under the age of 60 still had some antibodies that could neutralize the virus. Lancet microorganisms.. However, the response of so-called memory B cells and memory T cells is still evident in all, including patients who have lost neutralizing antibodies, regardless of the age or severity of the original infection. It wasn’t destroyed. ” The researcher said. These defenses cannot prevent infection, but they do help prevent serious illness.
“Current SARS-CoV-2 vaccines are primarily focused on neutralizing antibodies,” the researchers said. “These data highlight the importance of broad B-cell and T-cell immunity in future vaccine strategies targeting SARS-CoV-2.”
COVID during pregnancy is more common and less severe in Omicron
According to a new study, women who became pregnant during the recent surge in Omicron had a diagnosis rate of COVID-19 more than eight times, but the probability of serious illness compared to pregnant women diagnosed early in the pandemic. Has become low.
Doctors in Texas investigated 2,641 women with COVID-19 infection during pregnancy from May 2020 to January 2022. During the study, weekly births were the same, but the average weekly number of infected women who gave birth was 17 early in the pandemic14. 138 during the Delta era and 138 during the Omicron era, researchers reported: JAMA Thursday..
They found that less than 1% of women infected during the Omicron wave required hospitalization, compared to nearly 12% during the Delta. Dr. Emily Adikari, research leader at UT Southwestern, said in a statement that she was “extremely fortunate” that the infectivity of Omicron did not match its severity.
No adverse effects of mRNA shots on pregnant women, newborns
COVID-19 vaccination during pregnancy with mRNA shots such as from Moderna (MRNA.O) Or Pfizer (PFE.N) And BioNTech (22UAy.DE)According to two studies published at JAMA on Thursday, it does not seem to cause problems for women or their newborns.
One study Of the 157,521 pregnancies performed in Scandinavia, no significant association was found between the vaccine (mainly administered during the second or third trimester) and pregnancy problems. Other studies In Canada, 97,590 women were involved, of which 22,660 were vaccinated at least once during pregnancy and 44,815 were vaccinated after pregnancy. Vaccination during pregnancy was not significantly associated with maternal or baby birth complications compared to during pregnancy and without vaccination.
editorial Published in two reports call for similar studies in countries where other types of COVID-19 vaccines are more commonly used in pregnancy.
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Report by Nancy Rapid and Christine Soares. Edited by Bill Berkrot
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