Vaccination and Anesthesia Vaccines are broadly classified into two categories, that is, live attenuated (BCG, MMR) or inactivated (IPV). Rash and fever are common 7–10 days after MMR, parotitis 3 weeks after MMR, and local reactions and fever within 48 h of DtaP/IPV/Hib. In a survey of anaesthetists by Short and colleagues, 60% of the respondents stated that they would not delay anaesthesia for elective surgery in a recently immunized child, while 40% would postpone for a week for inactive vaccines and 3 weeks for live vaccine. As a conclusion, misinterpretation of vaccine-related adverse events as postoperative complications may be avoided by respecting a minimal delay between immunization and anaesthesia. A delay of 48 hours is needed for children immunized with inactivated vaccine. On the other hand, there is no need to delay anesthetic in a child immunized with live vaccine if the child is well at preoperative assessment. The influence of anaesthesia on various markers of immuni...