Automated DNA isolation
Bacteria were grown on blood agar plates at 36 æC
overnight. Subsequently, colonies were picked up
using a sterile 1 ml plastic loop and transferred into 184
ml sterile water and 16 ml proteinase K (15 mg/ml) followed
by incubation at 56 æC for 30 min. Subsequently,
automated DNA extraction was performed on a GenoM-48
nucleic acid extractor (http://www.qiagen.com)
using a MagAttract DNA Mini M48 kit optimised for
the extraction of bacterial DNA (Qiagen). DNA was
eluted in a final volume of 100 ml elution buffer provided
in the kit (Qiagen). 1 ml DNA solution was used
in each PCR amplification assay