Environmental and surface microbiological control: swabs. Aerobic microorganisms and enterobactericeae enumeration
Proficiency Test Parameters
The samples submitted are two swabs contaminated with different loads and wetted with 1 ml of preservation medium; for the enumeration of enterobacteriaceae and aerobic microorganism count respectively. This type of sample can be considered equivalent to the swabs used for sampling on a work surface (for example in an agri-food industry), or that made on the surface of a carcass for the evaluation of the slaughter hygiene by not destructive methods. Since the counts obtained, depending on the purpose of the test, would be expressed in different units, the results are requested expressed in "cfu/swab", since the expression in other units as cfu / cm2, are merely calculations to have in Count the sampled surface. The levels of contamination present may be within the regulatory limits for canal surfaces, or of a work surface with low or medium contamination.
The distribution of parameters, and thus the number or amount of sample containers may vary slightly from those shown in the original design, guaranteeing the necessary or equivalent amount for the test.