Contact Plate Method (RODAC Method)

- Replicate Organism Detection and Counting - used on smooth surfaces - best for cleaned & sanitized surfaces - highly contaminated surface --> overgrowth on agar plate - randomize selection of sampling sites - add neutralizers to agar to neutralize chemical sanitizer residues - plate with raised sterile agar medium - exposed agar pressed to flat surface - inoculated agar covered and incubated - bacterial colonies counted