ANCA-associated vasculitis
Antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV) is a rare disease with an annual incidence of approximately 20 per million population in Europe and North America. The aetiopathogenesis is complex and is mainly driven by the gene environment interactions. Genes associated with this condition include HLA-DQ (variations in which have been linked to asymptomatic COVID), IL-5 and GPA33. COVID-19 heralds a poor prognosis in those with preexisting AAV with over 50% patients having severe disease. Loss of smell is observed in AAV population more frequently (~50%) than in others (~35%). 70-year-old Chinese woman presented with poor appetite and nausea 4 hours after receiving the first dose of CoronaVac vaccine. These symptoms progressively worsened, followed by fatigue and foamy urine 10 days later. Her medical history included hypertension, hyperlipidemia, and kidney stones. She had penicillin allergy and no family history of ANCA-associated vasculitis. Treatment h