1.3 Virus induced urticarial rashes
Urticaria and acute urticarial rashes go along with up to 50% of all
cases with infections of the upper respiratory tract (59 ) and
are most often mediated by complement activation and serum sickness
induced by viral antigens or secondary mechanisms, due to the
interaction of the immune system with viral antigens. This could be also
the case in part of the SARS-CoV-2 positive patients with urticarial
eruptions (Fig. 7).