|Please read the Inclusion Criteria 1-4 below. These tell you both which patients to complete the form for, but also when to complete it. You will only be asked to complete the follow-up form once, but we ask for your email address in case we need to clarify something.|
|1) Adults age 18 or more|
2) Diagnosis of ITP made by a clinical haematologist, based on history, examination, full blood count and blood film examination consistent with international consensus definition (Provan 2019). Cases can be primary or secondary.
3) Patients who developed a significant new* episode of ITP within 30 days of COVID-19 vaccination, or developed a significant relapse** of existing ITP
* significant new episode defined as platelets <30
** significant relapse defined as platelets <30 and a fall from baseline pre-vaccine platelet count of 50% or more
4) Minimum follow-up time of 12 weeks from first vaccine, but also, if ITP is after first dose, give adequate duration of follow-up to determine impact of ITP on 2nd vaccine: either decision to defer, or if received 2nd dose, at least 4 weeks FU post 2nd Vaccine with FBC checks.
| ||Did the patient have a known history of ITP|
| ||Was it primary or secondary?|
| ||Had the patient received prior splenectomy|
| ||Was the patient on active ITP treatment at time of vaccine|