[Investigation of the sudden infant death syndrome: a multidisciplinary approach is required].

The concept of sudden infant death syndrome (SIDS) is defined as the sudden, unexpected death of an infant less than a year old which remains unexplained after in-depth investigations comprising a complete autopsy, biological analyses, and a clinical examination of the circumstances surrounding the death. This definition underlines the importance of finding the cause of this disease in order to improve preventative measures to reduce the number of deaths due to sudden infant death syndrome. Among the causes of SIDS, pediatric infectious diseases may be neglected and must be systematically sought after. We report upon a SIDS death case of a four and a half month-old that occurred during his sleep. Following the absence of an evident cause of death a scientific autopsy was performed. The histological examination of pulmonary tissue revealed broncolitic lesions associated with numerous micro-abscesses. The post mortem microbiological analyses revealed evidence of an infection by the respiratory syncytial virus complicated by a bacterial infection due to Haemophilus influenzae. The case underlines the necessity of a multidisciplinary approach to researching SIDS, involving both clinicians and biologists, in order to determine the causes of these deaths.