Table 1 Inclusion and exclusion criteria

Solid organ transplant recipient (liver, kidney, heart or lung)

Acute graft rejection within 15 days before selection

Age ≥16 years

Documented allergy and/or previous intolerance and/or contraindication to active compounds or excipients or any traces and/or residues in the vaccine

At least 30 days posttransplant

Previous medical record of any severe and/or life-threatening adverse reaction to the vaccine (such as Guillain-Barré syndrome)

Signed informed consent form

Confirmed pregnancy