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The COVID-19 (SARS-CoV-2) pandemic has massively distorted our health care systems and caused catastrophic consequences in our affected communities. The number of victims continues to increase and patients at risk can only be protected to a degree, since the virulent state may be asymptomatic. Risk factors concerning COVID-19-induced morbidity and mortality include advanced age, an impaired immune system, cardiovascular or pulmonary diseases, obesity, diabetes mellitus, and cancer treated with chemotherapy. Here within, we discuss the risk and impact of COVID-19 in patients with mastocytosis and mast cell activation syndromes. As no published data are yet available, expert opinions are, by necessity, based on case experience and reports from patients. Whereas the overall risk to acquire the SARS-CoV-2 virus may not be elevated in mast cell disease, certain conditions may increase the risk of infected patients to develop severe COVID-19. These factors include certain co-morbidities, mast cell activation-related events affecting the cardiovascular or bronchopulmonary system and chemotherapy or immunosuppressive drugs. Therefore, such treatments should be carefully evaluated on a case-by-case basis during a COVID-19 infection. By contrast, other therapies, such as anti-mediator-type drugs, venom immunotherapy, or vitamin D, should be continued. Overall, patients with mast cell disorders should follow the general and local guidelines in the COVID-19 pandemic and advice from their medical provider.
