PMID- 34285180 OWN - NLM STAT- MEDLINE DCOM- 20210722 LR - 20211204 IS - 1941-5923 (Electronic) IS - 1941-5923 (Linking) VI - 22 DP - 2021 Jul 21 TI - A Case of Immune Thrombocytopenia After BNT162b2 mRNA COVID-19 Vaccination. PG - e931478 LID - 10.12659/AJCR.931478 [doi] AB - BACKGROUND Immune thrombocytopenic purpura (ITP) is an immune response that destroys platelets and increases the risk of bleeding, which can range from bruising to intracranial hemorrhage. ITP is a known complication of coronavirus disease 2019 (COVID-19). In the first studies of the BNT162b2 messenger RNA (mRNA) COVID-19 vaccine, there were no reports of ITP and the incidence of serious adverse events (AEs) was low overall. Here, we present a case of ITP as a complication of the BNT162b2 mRNA COVID-19 vaccine. CASE REPORT Three days after receiving a second dose of the BNT162b2 mRNA COVID-19 vaccine, a 39-year-old woman presented with a petechial rash on her trunk, legs, and arms, and fatigue and muscle aches. At the time of her hospital admission, her platelet count was 1000/microL. A peripheral smear showed profound thrombocytopenia. During the course of the patient's hospitalization, she was treated with 2 units of platelets, 2 infusions of i.v. immunoglobulin, and i.v. methylprednisolone. Her platelet count increased to 92 000/microL on the day of discharge and she was prescribed a tapered dose of oral prednisone. One day later, her rash had resolved and her platelet count was 243 000/microL. The patient recovered completely with no complications. CONCLUSIONS ITP should be considered a severe AE of the BNT162b2 mRNA COVID-19 vaccine. Knowing the early signs and symptoms of ITP will become increasingly important as more of the population receives this vaccine. Quick diagnosis and management are essential to avoid life-threatening bleeding. FAU - King, Eleanor R AU - King ER AD - Department of Family Medicine, Ascension Providence Rochester Hospital, Rochester, MI, USA. FAU - Towner, Elizabeth AU - Towner E AD - Department of Family Medicine and Public Health Sciences, Wayne State University, Detroit, MI, USA. LA - eng PT - Case Reports PT - Journal Article DEP - 20210721 PL - United States TA - Am J Case Rep JT - The American journal of case reports JID - 101489566 RN - 0 (COVID-19 Vaccines) RN - 0 (RNA, Messenger) RN - N38TVC63NU (BNT162 Vaccine) SB - IM MH - Adult MH - BNT162 Vaccine MH - *COVID-19 MH - COVID-19 Vaccines MH - Female MH - Humans MH - *Purpura, Thrombocytopenic, Idiopathic MH - RNA, Messenger/genetics MH - SARS-CoV-2 MH - *Thrombocytopenia/etiology MH - Vaccination/adverse effects PMC - PMC8311388 COIS- Conflict of interest: None declared Conflict of interest None. EDAT- 2021/07/22 06:00 MHDA- 2021/07/23 06:00 PMCR- 2021/07/21 CRDT- 2021/07/21 05:49 PHST- 2021/07/21 05:49 [entrez] PHST- 2021/07/22 06:00 [pubmed] PHST- 2021/07/23 06:00 [medline] PHST- 2021/07/21 00:00 [pmc-release] AID - 931478 [pii] AID - 10.12659/AJCR.931478 [doi] PST - epublish SO - Am J Case Rep. 2021 Jul 21;22:e931478. doi: 10.12659/AJCR.931478.