title: Correspondence (letter to the editor): Many questions remained unanswered.
authors: Monika
authors: M
authors: Weber
mesh_terms: D005260:Female; D006801:Humans; D006969:Hypersensitivity, Immediate / Q000453:epidemiology* / Q000517:prevention & control*; D017053:Infection Control / Q000706:statistics & numerical data*; D007239:Infections / Q000453:epidemiology*; D008297:Male; D032541:Mass Vaccination / Q000706:statistics & numerical data*