Ans. (c) Cryptococcus s(j. journal of ,\,11crobiology 2013 Nov. 3478-3484 13-D-glucan is the component of fungal cell-wall of all fungus (except cryptococcus, zygomycetes and blastomyces dermatidis) which is detectable in case of invasive infection. Currently Fungitell assay is a FDA approved 13-DG assay which is positive in invasive candidiasis, Aspergillism and pneumocystis jirovecii. False positive reaction may be seen with ceain hemodialysis filters, beta lactam antimicrobials and immunoglobulins