The agency also admitted that, in addition to the deaths, another 30 cases of clots were reported in vaccinated people, but says that it is still not possible to establish a causal relationship between the clots and the immunizing formula. The agency ensured that a “rigorous review of UK reports on rare and specific types of blood clots is underway”. Information on the ages or health conditions of people who died has not been released.
The 30 cases of blood clot have been identified out of a total of 18.1 million doses of AstraZeneca administered by March 24, according to the MHRA. For this reason, the agency stated that the risk is “very small”.
Concerns about the Oxford / AstraZeneca vaccine have led some countries, such as Canada, France, Germany and the Netherlands, to restrict the use of the formula. The World Health Organization (WHO), however, has adopted a position similar to the MHRA, stating that the benefits of vaccination outweigh the risks.
What are blood clots?
Blood clots are formed due to problems in the circulatory system of patients. The problem is relatively common and manageable with medications. In some cases, however, the clots come off, fall into the patients’ bloodstream and can reach the lungs, thus causing pulmonary embolism.
Two recent studies – one from Norway and one from Germany – suggest that, in very rare cases, the immunizer could trigger an attack by the body on blood platelets. To compensate for the lost cells, the body would produce an exaggerated amount of platelets, making the blood thicker and, consequently, creating clots.
Other investigations seek to draw a profile of the patients who registered the symptom and, in this case, the hypothesis is that the use of contraceptives and smoking are risk factors.
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