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Leukine, also known as sargramostim, is a recombinant human granulocyte-macrophage colony-stimulating factor (GM-CSF) that stimulates the production of white blood cells, specifically neutrophils and macrophages. Patients at high risk of infection, such as those undergoing chemotherapy or those with conditions that lead to prolonged neutropenia, benefit from this treatment. By enhancing the production and function of these immune cells, Leukine helps improve the body’s ability to fight off infections, making it an appropriate intervention for high-risk patients.

In contrast, the other medications listed serve different purposes. Ranitidine is primarily used to reduce stomach acid and treat conditions like gastroesophageal reflux disease, but it does not directly affect the immune response. Aspirin is an anti-inflammatory and analgesic agent that does not provide the immune support necessary for infection risk management. Warfarin is an anticoagulant used to prevent blood clots, which is unrelated to infection risk enhancement. Thus, Leukine stands out as the treatment option aimed directly at improving immune function in patients vulnerable to infections.