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The rare simultaneous occurrence of thrombocytopenia (low blood platelets) with blood clots after vaccination raised the original concern about this condition. [citation needed] In many cases where acute thrombosis and thrombocytopenia have been found together after COVID‑19 vaccination, an antibody against platelet factor 4 has been ...
Compensation is payable for "table" injuries, those listed in the Vaccine Injury Table, as well as, "non-table" injuries, injuries not listed in the table. [29] In addition, an award may only be given if the claimant's injury lasted for more than 6 months after the vaccine was given, resulted in a hospital stay and surgery or resulted in death.
Injection site reactions (ISRs) are reactions that occur at the site of injection of a drug. They may be mild or severe and may or may not require medical intervention. Some reactions may appear immediately after injection, and some may be delayed. [1] Such reactions can occur with subcutaneous, intramuscular, or intravenous administration.
Mechanisms underlying the cause of reactogenicity symptoms. In clinical trials, reactogenicity is the capacity of a vaccine to produce common, "expected" adverse reactions, especially excessive immunological responses and associated signs and symptoms, including fever and sore arm at the injection site.
SIRVA is caused by improper insertion of the needle used in injections. It is "a preventable occurrence caused by the injection of a vaccine into the shoulder capsule rather than the deltoid muscle. As a result, inflammation of the shoulder structures causes patients to experience pain, a decreased range of motion, and a decreased quality of life."
Arthus reactions (type III hypersensitivity reactions) are rarely reported after vaccination and can occur after tetanus toxoid–containing or diphtheria toxoid–containing vaccines. An Arthus reaction is a local vasculitis associated with deposition of immune complexes and activation of complement. Immune complexes form in the setting of ...
Many medical researchers make use of VAERS to study the effects of vaccination. VAERS warns researchers using its database that the data should not be used in isolation to draw conclusions about cause and effect. [11] Nonetheless, raw data from VAERS has been used in vaccine litigation to support the claim that vaccines cause autism.
When a patient receives multiple vaccines in one visit or a combination vaccine, a VIS should be given for each vaccine or component. The Multi-Vaccine VIS can be used for children receiving DTaP, polio, Hib, hepatitis B, and pneumococcal conjugate vaccines. The Multi-Vaccine VIS is not designed for adults or adolescents. [9] [10]
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