The BBL CultureSwab and BBL CultureSwab Plus products are packaged Vi-Pak foil
Nitrogen gas is injected into both the foil pack and the individual swab packages
This inner environment works synergistically with sodium thioglycollate in the transport medium to create an ideal Eh potential
Together, the metallic foil of the outside packaging and the plastic film of the individual swabs block the entry of oxygen and prevent unwanted oxidation of the transport medium