Among the complications most attributed to Covid-19 is thrombosis. The formation of blood clots in the veins or arteries in the weeks following the coronavirus infection, impairing blood circulation, was one of the symptoms seen frequently among patients around the world. At the beginning of the pandemic, the phenomenon was even used to explain most deaths from the disease.
In a study published in Nature magazine last week, researchers from the Faculty of Medicine at Imperial College London, in the United Kingdom, claim to have discovered an explanation for the situation.
A “deregulation” in the function of monocytes, blood cells of the body’s defense system with important functions in detecting invaders and in activating the innate and adaptive immune response during viral infection, may be behind the formation of thrombi in some patients of the Covid-19.
To reach this conclusion, scientists examined the function of monocytes from patients with mild and moderate Covid-19 during the acute phase of the infection and compared it with the process in healthy individuals.
The blood defense cells of infected patients, which should protect them against the action of the virus, showed an altered expression of cell surface receptors and a dysfunctional metabolic profile, triggering a prothrombotic effect.
During a viral infection, circulating monocytes should infiltrate affected tissues, contributing to the elimination of pathogens and tissue regeneration.
Faced with the pandemic scenario and the expansion of the booster dose, some people are still wondering about the importance of the third dose of the vaccine against Covid-19stock
The booster dose must be administered at least four months after the individual completes the initial vaccination schedule. The extra application serves to increase the amount of memory cells and further strengthen the antibodies they produce.Rafaela Felicciano/Metropolises
Experts point out that one of the main measures provided by the booster dose is the expansion of the immune response. The third dose causes an increase in the amount of antibodies circulating in the body, which reduces the chance of the immunized person getting sick.Tomaz Silva/Agência Brasil
For the elderly and immunosuppressed, the booster dose increases the effectiveness of immunization, since these groups do not develop an adequate immune responseHugo Barreto/Metropolises
Another important measure is the reduction of the chance of infection in case of new variants. The antibody promoted by the vaccine is directed to the strain that gave rise to the formula and, in this process, people also produce antibodies that have diversity. The greater the reach of the proteins that defend the organism, the greater the probability that some will bind to the new variantWestend61/GettyImages
The director of the Brazilian Society of Immunizations (SBIM) and member of the Technical Advisory Committee of the National Immunization Program of the Ministry of Health, Renato Kfouri says that the mixture of vaccines from different laboratories is a Rafaela Felicciano/Metropolises
A study conducted by the University Hospital Southampton NHS Foundation Trust in the United Kingdom showed that people who received two doses of AstraZeneca had a 30-fold increase in antibody levels after a Moderna booster, and a 25-fold increase with a booster. pfizerArthur Menescal/Metrópoles Special
Reactions to the booster dose are similar to the previous two doses. Mild to moderate symptoms such as excessive tiredness and pain at the injection site are expected. However, there are also reports of symptoms that include local redness or swelling, headache, muscle pain, chills, fever or nausea.Rafaela Felicciano/Metropolises
It is worth noting that the use of three doses has the main objective of reducing the number of severe cases and the number of hospitalizations due to Covid-19.Vinícius Schmidt/Metrópoles
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It is estimated that between 0.6 and 2 patients per 100,000 infected with the coronavirus have clot formation during infection, increasing the risk of thrombosis. With the Covid-19 vaccine, the chance of developing the problem decreases by up to 10 times.
Scientists hope the discovery can be used to advance the understanding of coronavirus infection and the development of treatments that reduce post-infection risks.
“These results identify a potential mechanism by which monocyte dysfunction may contribute to the COVID-19 study,” the study authors state in the paper.
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