Influenza B Antigen, Strain Hong Kong 5/72

Store at -70 °C. Avoid repeated freezing and thawing. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Aliquots are stable for at least 6 months. The preparation might be slightly cloudy or contain minor precipitate upon thawing. Do not sonicate and do not clarify prior to dilution at least 10-fold with working buffer.