If Dengvaxia is given intramuscularly instead of subcutaneously, should the dose be repeated?

No, the dose should not be repeated. In accordance with CDC’s “General Best Practice Guidelines for Immunization”, the immune response to vaccines recommended to be administered by the subcutaneous route is unlikely to be affected if the vaccines are inadvertently administered by the intramuscular route. For this reason, repeating doses of vaccine administered by the intramuscular route when recommended by the subcutaneous route is not necessary (www.cdc.gov/vaccines/hcp/acip-recs/general-recs/administration.html).