IL3 and viral infectious disease: -Cytokine receptor important for the proliferation and differentiation of hematopoietic cells, potentially influencing activation, survival and differentiation of eosinophils via IL-3-mediated signaling. Expressed during all stages of eosinophil maturation, but the highest levels are found in mature eosinophils (67). - Regulates the activation of plasmacytoid dendritic cells, which are involved in producing large amounts of type I interferons in response to viral infections.