evidence: The authors conducted a two-year prospective study on the vaccination status of infants with SIDS who died between 1 and 3 months of age to assess whether vaccination increased the risk of SIDS in this population in France. The authors found DTPP ± Hib immunization did not increase the risk of SIDS. [...] The authors evaluated recent immunization with DTP as a possible risk factor for SIDS during a 10-year period in Tennessee. They found no increase in the risk of SIDS after immunization with DTP vaccine and no correlation between SIDS and age at first immunization. Additionally, the rate of SIDS decreased in the first week after immunization. [...] The authors investigated the possible association between diphtheria-tetanus-pertussis (DTP) immunization and subsequent occurrence of sudden infant death in the United States using data from a national SIDS epidemiological database. They found no temporal association between SIDS and DTP vaccine receipt. Infants with SIDS were less likely to have been immunized than infants without SIDS.