CD33 and malaria: Complement receptor 1 (highly expressed in myeloid CD33+ cells (bone marrow) http://www.biogps.org/#goto=genereport&id=1378/) is a receptor for herpes simplex, adenovirus 5, the influenza virus and HIV-1, as well as for a number of other pathogens, including P. gingivalis, C. neoformans, Streptococcus pneumoniae, Staphylococcus aureus, and the malaria parasite, Plasmodium falciparum [37–43] and is a general clearance receptor for complement opsonised pathogens [44].