PTGDR2 and Increased total eosinophil count: In contrast, a short duration, higher HDM dose (total of 300 μg) in vivo study resulted in a BAL eosinophilia of around 350,000 cells/mL in the saline control group, which was almost totally resolved with intraperitoneal dexamethasone and reduced by approximately 50% with CRTH2 antagonist treatment [29].