Statement of Principles concerning vaccine-induced thrombotic thrombocytopaenia (Balance of Probabilities) (No. 34 of 2022) (Cth)

Statement of Principles concerning VACCINE-INDUCED THROMBOTIC THROMBOCYTOPAENIA (Balance of Probabilities) (No. 34 of 2022) The Repatriation Medical Authority determines the following Statement of Principles under subsection 196B(3) of the Veterans' Entitlements Act 1986.

Dated 4 March 2022

The Common Seal of the Repatriation Medical Authority was affixed to this instrument at the direction of:

Professor Terence Campbell AM Chairperson

Contents 1 Name 2 Commencement 3 Authority 4 Application 5 Definitions 6 Kind of injury, disease or death to which this Statement of Principles relates 7 Basis for determining the factors 8 Factors that must exist 9 Relationship to service 10 Factors referring to an injury or disease covered by another Statement of Principles Schedule 1 - Dictionary 1 Definitions

1 Name This is the Statement of Principles concerning vaccine-induced thrombotic thrombocytopaenia (Balance of Probabilities) (No. 34 of 2022). 2 Commencement This instrument commences on 4 April 2022. 3 Authority This instrument is made under subsection 196B(3) of the Veterans' Entitlements Act 1986. 4 Application This instrument applies to a claim to which section 120B of the VEA or section 339 of the Military Rehabilitation and Compensation Act 2004 applies. 5 Definitions The terms defined in the Schedule 1 - Dictionary have the meaning given when used in this instrument. 6 Kind of injury, disease or death to which this Statement of Principles relates (1) This Statement of Principles is about vaccine-induced thrombotic thrombocytopaenia and death from vaccine-induced thrombotic thrombocytopaenia. Meaning of vaccine-induced thrombotic thrombocytopaenia (2) For the purposes of this Statement of Principles, vaccine-induced thrombotic thrombocytopaenia means a disorder of coagulation in which there is formation of blood clots in the vascular system in association with a low platelet count, in a person with no exposure to heparin within the previous 30 days. Note 1: Vaccine-induced thrombotic thrombocytopaenia (VITT) is also known as vaccine-induced immune thrombotic thrombocytopaenia and thrombosis with thrombocytopaenia syndrome. Note 2: Platelet counts are typically below 150,000 per microlitre, but some patients with platelet levels within the normal range may have had, or later will have, a significant drop in platelet levels, or may have the diagnosis confirmed by the presence of other clinical features that are typical of vaccine-induced thrombotic thrombocytopaenia. Note 3: Thrombosis often occurs in locations which are unusual for other kinds of thrombotic disorders, including the cerebral venous sinuses, the portal vein and the splenic vein. Patients may concurrently or separately have thrombosis or embolism in more common locations, including venous thromboembolism (for example, deep vein thrombosis and pulmonary thromboembolism) and arterial thromboembolism (for example, acute myocardial infarction and ischaemic cerebrovascular accident). Note 4: The diagnosis of vaccine-induced thrombotic thrombocytopaenia is supported by evidence of thrombosis on imaging, elevated D-dimer levels, low fibrinogen levels, detection of antibodies against platelet factor 4–polyanion complexes or detection of platelet-activating antibodies on functional testing. Death from vaccine-induced thrombotic thrombocytopaenia (3) For the purposes of this Statement of Principles, vaccine-induced thrombotic thrombocytopaenia, in relation to a person, includes death from a terminal event or condition that was contributed to by the person's vaccine-induced thrombotic thrombocytopaenia. Note: terminal event is defined in the Schedule 1 - Dictionary. 7 Basis for determining the factors On the sound medical‑scientific evidence available, the Repatriation Medical Authority is of the view that it is more probable than not that vaccine-induced thrombotic thrombocytopaenia and death from vaccine-induced thrombotic thrombocytopaenia can be related to relevant service rendered by veterans or members of the Forces under the VEA, or members under the MRCA. Note: MRCA, relevant service and VEA are defined in the Schedule 1 - Dictionary. 8 Factors that must exist At least one of the following factors must exist before it can be said that, on the balance of probabilities, vaccine-induced thrombotic thrombocytopaenia or death from vaccine-induced thrombotic thrombocytopaenia is connected with the circumstances of a person's relevant service: (1) having received an adenovirus vector coronavirus disease 2019 (COVID-19) vaccine within the 100 days before the clinical onset of vaccine-induced thrombotic thrombocytopaenia; Note: Examples of adenovirus vector COVID-19 vaccines include: