E. coli DH5α

E. coli K-12 derivatives, such as, DH5α, are recognised as non-colonising and disabled, and may be considered to be equivalent to ACDP biological agents hazard group 1. They are not considered pathogenic to humans or animals. They are expected to have limited survivability in the environment and often have auxotrophic requirements, which are unlikely to be satisfied outside laboratory culture. - http://www.tradeunionstudiesleeds.org.uk/Resources/HandSPub/Legal/l29.pdf