In addition, the Guardian reported the following last year-
“The investigation, by a team of microbiologists from Southampton University and published in the US journal mBio, found that bacilli such as listeria and salmonella remain completely active after chlorine washing. The process merely makes it impossible to culture them in the lab, giving the false impression that the chlorine washing has been effective.
Apart from a few voluntary codes, the American poultry industry is unregulated compared with that in the EU, allowing for flocks to be kept in far greater densities and leading to a much higher incidence of infection. While chicken farmers in the EU manage contamination through higher welfare standards, smaller flock densities and inoculation, chlorine washing is routinely used in the US right at the end of the process, after slaughter, to clean carcasses. This latest study indicates it simply doesn’t work.
This is very concerning. Chlorine-washed chicken, giving the impression of being safe, can cross contaminate the kitchen
Professor William Keevil
Currently, chlorine-washed chicken is barred from entry to the EU on animal welfare grounds and has become a contentious issue for opponents of liberal trade deals with the US post-Brexit.”
You can read the scientific study here
mbio.asm.org/content/9/2/e00540-18.full