A flare of EGPA after vaccination for COVID-19, description and follow-up of a clinical case

ABSTRACT

Background: Although rarely, vaccines can stimulate the immunological mechanisms underlying immune-mediated inflammatory diseases. in patients with COVID-19 there is also evidence that high titers of autoantibodies, with variable clinical relevance, can be detected. Method(s) We describe the case of a 71-year- old lady diagnosed with eosinophilic granulomatosis with polyangiitis (EGPA) in 2010 with paraesthesia, myalgia, eosinophilia and severe asthma. After induction of remission, the patient has shown regression of the vasculitis but persistence of the uncontrolled asthma. For this reason, since February 2019 she started Mepolizumab 100 mg/month. In December 2020 she tested positive for the SARS-CoV- 2 virus, manifesting a mild form then she tested negative in January 2021. In April 2021 she was vaccinated with a single dose of BNT162b2 mRNA vaccine. After about 10 days, she started to complain arthromyalgia and after a week of gait alteration, paraesthesia, dyspnoea and worsening cough associated with chest pain. Blood tests showed an increase in creatinephosphokinase (CPK 955 U/L) and hypereosinophilia (4.3x10