Relationship between blood clots and COVID-19 vaccines: A literature review
Thrombotic events have been officially reported after the Pfizer COVID-19 vaccine. DVT was confirmed in one case in February 2021 [55]. Moreover, the first case on immune thrombocytopenia was also reported in a 22-year-old patient suffering from gum bleeding and petechiae after vaccination with Comirnaty in January 2021 [56]. Although these events are closely related to blood, they cannot accurately be counted as VITT or TTS; therefore, such cases can be purely coincidental despite the incidence rate (reported to be 3.3 per 100,000) [57]. However, it could be obviously concluded that VITT is presumably caused by the production of antibodies against PF-4 in patients who demonstrate TTS symptoms after vaccination
The first related event to clotting was reported in a 60-year-old man who experienced thrombocytopenia (but not a VITT/TTS) and purpuric after being vaccinated by Moderna COVID-19 vaccine [60]. However, the incidence of acute deep vein thrombosis (ADVT) was also reported as a blood clotting-related event after Moderna vaccination [61].
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9055170/
Relationship between blood clots and COVID-19 vaccines: A literature review
Thrombotic events have been officially reported after the Pfizer COVID-19 vaccine. DVT was confirmed in one case in February 2021 [55]. Moreover, the first case on immune thrombocytopenia was also reported in a 22-year-old patient suffering from gum bleeding and petechiae after vaccination with Comirnaty in January 2021 [56]. Although these events are closely related to blood, they cannot accurately be counted as VITT or TTS; therefore, such cases can be purely coincidental despite the incidence rate (reported to be 3.3 per 100,000) [57]. However, it could be obviously concluded that VITT is presumably caused by the production of antibodies against PF-4 in patients who demonstrate TTS symptoms after vaccination
The first related event to clotting was reported in a 60-year-old man who experienced thrombocytopenia (but not a VITT/TTS) and purpuric after being vaccinated by Moderna COVID-19 vaccine [60]. However, the incidence of acute deep vein thrombosis (ADVT) was also reported as a blood clotting-related event after Moderna vaccination [61].