Samples of tissue from the stomachs, trachea and lungs of 32 babies up to seven months of age who had died of SIDS were examined histologically for the presence of the bacteria, and extracted DNA from these tissues examined for ureC and cagA genes.
Similar tissue samples were also examined for comparison from eight babies who had died of other known causes.
H. pylori ureC or cagA genes found in 88% of the SIDS babies.
One or both genes were present in one or more tissue samples among 28 of the 32 SIDS babies, a prevalence of 88 per cent. The genes were found in only one of the eight comparison babies.
Dr Kerr of the Manchester-based team concluded, "There is a highly significant association between H. pylori ureC and cagA genes in the stomach, trachea, and lung of cases of SIDS when compared with controls."