We much appreciated the study by Filleron and coworkers.1 The authors analysed the literature concerning cases of group B streptococcus (GBS) late-onset disease (LOD) associated with infected milk. The presence of GBS in milk is a controversial issue and differences in definitions or methods used in some studies can lead to conflicting results. For example, some studies cited in this review provide no information concerning milk collection or milk culture methods. Most studies do not measure the bacterial inoculum, an aspect that could be crucial. Therefore, it is possible that in some cases reported in the literature, the milk was ‘contaminated’ with GBS during sampling rather than previously ‘infected’.

Filleron et …