CARD9 and pneumocystosis: To evaluate this, we further compared the Clec7a−/−Fcer1g−/− and Card9−/− mouse strains with the Fcer1g−/− strain lacking only the FcRγ chain in both the CD4-depleted immunocompromised (Fig. 7A) and 30-day immunocompetent PCP mouse models (Fig. 7B).