I mice model blocking of IL-33 inhibited tumor growth in immunodeficient mice. The tumor fragments are either implanted heterotopically or orthotopically into an immunodeficient mouse. SzJ. NSG branded mice are among the most immunodeficient described to date. However, due to the live nature of attenuated viruses, complications may arise in immunodeficient patients. HIV-infected patients are a subgroup of the immunodeficient FUO, and frequently have fever. For instance, not all tumor samples will successfully engraft in an immunodeficient mouse. "A. fumigatus" is the most common species to cause disease in immunodeficient humans. Around the world, parasitic pneumonia is most common in the immunodeficient. Immunodeficient neonates are susceptible to systemic "T. rubrum" infection.