期刊
JOURNAL OF THROMBOSIS AND HAEMOSTASIS
卷 19, 期 7, 页码 1813-1818出版社
ELSEVIER SCIENCE INC
DOI: 10.1111/jth.15352
关键词
COVID-19 vaccines; COVID-19 vaccines/adverse effects; drug related side effects and adverse reactions; platelet factor 4; thrombocytopenia
资金
- Northern Norway Regional Health Authority (Helse Nord)
This study investigated the prevalence of thrombocytopenia and anti-PF4/polyanion antibodies in a population recently vaccinated with AZD1222. The results showed a low prevalence of both conditions among Norwegian health care workers after vaccination with AZD1222, with the majority of participants having normal platelet counts and negative immunoassay results.
Background The COVID-19 vaccine from AstraZeneca (AZD1222) is one of several vaccines introduced to provide immunity against SARS-CoV-2. Recently, more than 50 cases have been reported presenting a combination of thrombosis, thrombocytopenia, and remarkably high levels of anti-platelet factor 4 (PF4)/polyanion antibodies post-AZD1222 vaccination. Now linked to the vaccine, the condition is referred to as vaccine-induced immune thrombotic thrombocytopenia. The European Medicines Agency still recommends vaccination with AZD1222, but several European countries have temporally paused and/or restricted its use because of the perceived risk of this severe side effect. Because there is no description of PF4/polyanion antibody testing in the clinical trials, knowledge about the prevalence of such antibodies in a vaccinated cohort is needed. Objectives To investigate prevalence of thrombocytopenia and anti-PF4/polyanion antibodies in a population recently vaccinated with AZD1222. Patients/Methods Four hundred and ninety-two health care workers recently vaccinated with the first dose of AZD1222 were recruited from two hospitals in Norway. Study individuals were screened for thrombocytopenia and the presence of anti-PF4/polyanion antibodies with a PF4/PVS immunoassay. Side effects after vaccination were registered. Results The majority of study participants had normal platelet counts and negative immunoassay. Anti-PF4/polyanion antibodies without platelet activating properties were only detected in six individuals (optical density >= 0.4, range 0.58-1.16), all with normal platelet counts. No subjects had severe thrombocytopenia. Conclusions We found low prevalence of both thrombocytopenia and antibodies to PF4/polyanion-complexes among Norwegian health care workers after vaccination with AZD1222.
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