pgg-glucan pgg-glucan poly---d-glucopyranosyl---d-glucopyranose glucan (pgg glucan, proprietary name betafectin) is an anti-infective agent and a form or type of beta-glucan. betafectin is a pgg-glucan, a novel β-(1,6) branched β-(1,3) glucan, purified from the cell walls of saccharomyces cerevisiae. it is a macrophage-specific immunomodulator.