Shigella genus (AP)

May be stored at 4 degree C for short-term only. For long-term storage, to avoid repeated freezing and thawing, reconstitute in sterile 50% glycerol, aliquot and store at -20 degree C. Aliquots are stable for 12 months at -20 degree C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.