Cryopreserved Diseased Bronchial Epithelial cells test negative for mycoplasma, bacteria, yeast, and fungi. HIV-1, hepatitis B and hepatitis C are not detected for all donors and/or cell lots. Product Link: http://www.creative-bioarray.com/Diseased-Human-Bronchial-Epithelial-Asthma-CSC-C8070L-item-40380.htm