Which demographic groups are most affected by VIPIT?

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VIPIT Appears Primarily Associated with Women Under 65

Vaccine-induced prothrombotic immune thrombocytopenia (VIPIT), a rare condition linked to the Oxford/AstraZeneca Covid-19 vaccine, has thus far been predominantly observed in women under the age of 65. This demographic specificity has been noted in reports from various countries as investigations into the condition continue.
Association with Women Under 65

Current observations suggest that VIPIT is largely associated with women who have not yet reached the age of 65. This finding has emerged from analyses of reported cases following vaccination with the AstraZeneca jab.
Incidence Rates in Specific Age Groups

In Norway, for instance, reports indicate that one in every 25,000 vaccinated adults under 65 experienced symptoms consistent with VIPIT, including low platelet counts, bleeding, and widespread thromboses. This figure highlights a specific incidence rate within a defined demographic.
Broader Thrombocytopenia Context

While VIPIT is a specific vaccine-related phenomenon, thrombocytopenia itself, a condition characterised by a reduced number of platelets, affects approximately one in 30,000 adults annually in the United States. The vaccine-induced form is considered significantly rarer, with some data suggesting an incidence as low as one in 500,000, although these figures are acknowledged as incomplete.
Potential Mechanisms and Immune Response

The "prothrombotic immune" aspect of VIPIT points to an over-activation of the immune system. The AstraZeneca vaccine prompts the body to produce antibodies against the spike protein of the SARS-CoV-2 virus. In some individuals, these antibodies appear to react with platelets, causing them to aggregate and form blood clots, which in turn reduces the number of circulating platelets. This mechanism is being compared to heparin-induced thrombocytopenia, where similar antibodies can form.

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Which demographic groups are most affected by VIPIT?

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